Merge branch 'master' of scm.dev.nokia.troll.no:qt/qt-s60-public

Conflicts:
	mkspecs/features/symbian/qt.prf
	qmake/Makefile.unix
	qmake/Makefile.win32
	qmake/Makefile.win32-g++
	qmake/Makefile.win32-g++-sh
	qmake/generators/symbian/initprojectdeploy_symbian.cpp
	src/src.pro

25 files changed, 518 insertions, 165 deletions

diff --git a/src/corelib/arch/qatomic_s390.h b/src/corelib/arch/qatomic_s390.h
index 21f5037..273c17b 100644
--- a/src/corelib/arch/qatomic_s390.h
+++ b/src/corelib/arch/qatomic_s390.h
@@ -366,11 +366,9 @@ template <typename T>
 Q_INLINE_TEMPLATE T* QBasicAtomicPointer<T>::fetchAndStoreRelaxed(T *newValue)
 {
 #ifndef __s390x__
-    return (T*)__CS_OLD_LOOP(reinterpret_cast<volatile long*>(_q_value), (int)newValue, "lr",
-                             "", "bcr 15,0\n");
+    return (T*)__CS_OLD_LOOP(&_q_value, (int)newValue, "lr", "", "");
 #else
-    return (T*)__CSG_OLD_LOOP(reinterpret_cast<volatile long*>(_q_value), (long)newValue, "lgr",
-                              "", "bcr 15,0\n");
+    return (T*)__CSG_OLD_LOOP(&_q_value, (long)newValue, "lgr", "", "");
 #endif
 }
 
@@ -378,9 +376,9 @@ template <typename T>
 Q_INLINE_TEMPLATE T* QBasicAtomicPointer<T>::fetchAndStoreAcquire(T *newValue)
 {
 #ifndef __s390x__
-    return (T*)__CS_OLD_LOOP(reinterpret_cast<volatile long*>(_q_value), (int)newValue, "lr", "", "");
+    return (T*)__CS_OLD_LOOP(&_q_value, (int)newValue, "lr", "", "bcr 15,0 \n");
 #else
-    return (T*)__CSG_OLD_LOOP(reinterpret_cast<volatile long*>(_q_value), (long)newValue, "lgr", "", "");
+    return (T*)__CSG_OLD_LOOP(&_q_value, (long)newValue, "lgr", "", "bcr 15,0 \n");
 #endif
 }
 
@@ -388,11 +386,9 @@ template <typename T>
 Q_INLINE_TEMPLATE T* QBasicAtomicPointer<T>::fetchAndStoreRelease(T *newValue)
 {
 #ifndef __s390x__
-    return (T*)__CS_OLD_LOOP(reinterpret_cast<volatile long*>(_q_value), (int)newValue, "lr",
-                             "bcr 15,0 \n", "");
+    return (T*)__CS_OLD_LOOP(&_q_value, (int)newValue, "lr", "bcr 15,0 \n", "");
 #else
-    return (T*)__CSG_OLD_LOOP(reinterpret_cast<volatile long*>(_q_value), (long)newValue, "lgr",
-                              "bcr 15,0\n", "");
+    return (T*)__CSG_OLD_LOOP(&_q_value, (long)newValue, "lgr", "bcr 15,0\n", "");
 #endif
 }
 
diff --git a/src/corelib/arch/qatomic_symbian.h b/src/corelib/arch/qatomic_symbian.h
index f1d332f..fa4e4a9 100644
--- a/src/corelib/arch/qatomic_symbian.h
+++ b/src/corelib/arch/qatomic_symbian.h
@@ -42,7 +42,7 @@
 #ifndef QATOMIC_SYMBIAN_H
 #define QATOMIC_SYMBIAN_H
 
-#include <qglobal.h>
+#include <QtCore/qglobal.h>
 #include <e32std.h>
 
 QT_BEGIN_HEADER
diff --git a/src/corelib/codecs/qtextcodec.cpp b/src/corelib/codecs/qtextcodec.cpp
index 1c607a6..ca5e658 100644
--- a/src/corelib/codecs/qtextcodec.cpp
+++ b/src/corelib/codecs/qtextcodec.cpp
@@ -80,6 +80,7 @@
 #endif // QT_NO_CODECS
 #include "qlocale.h"
 #include "qmutex.h"
+#include "qhash.h"
 
 #include <stdlib.h>
 #include <ctype.h>
@@ -172,6 +173,7 @@ static QTextCodec *createForMib(int mib)
 }
 
 static QList<QTextCodec*> *all = 0;
+static int clearCaches = 0;  // flags specifying if caches should be invalided: 0x1 codecForName, 0x2 codecForMib
 #ifdef Q_DEBUG_TEXTCODEC
 static bool destroying_is_ok = false;
 #endif
@@ -935,6 +937,7 @@ QTextCodec::~QTextCodec()
         QMutexLocker locker(textCodecsMutex());
 #endif
         all->removeAll(this);
+        clearCaches = 0x1 | 0x2;
     }
 }
 
@@ -961,17 +964,33 @@ QTextCodec *QTextCodec::codecForName(const QByteArray &name)
 #endif
     setup();
 
+    static QHash <QByteArray, QTextCodec *> cache;
+    if (clearCaches & 0x1) {
+        cache.clear();
+        clearCaches &= ~0x1;
+    }
+    QTextCodec *codec = cache.value(name);
+    if (codec)
+        return codec;
+
     for (int i = 0; i < all->size(); ++i) {
         QTextCodec *cursor = all->at(i);
-        if (nameMatch(cursor->name(), name))
+        if (nameMatch(cursor->name(), name)) {
+            cache.insert(name, cursor);
             return cursor;
+        }
         QList<QByteArray> aliases = cursor->aliases();
         for (int y = 0; y < aliases.size(); ++y)
-            if (nameMatch(aliases.at(y), name))
+            if (nameMatch(aliases.at(y), name)) {
+                cache.insert(name, cursor);
                 return cursor;
+            }
     }
 
-    return createForName(name);
+    codec = createForName(name);
+    if (codec)
+        cache.insert(name, codec);
+    return codec;
 }
 
 
@@ -986,19 +1005,34 @@ QTextCodec* QTextCodec::codecForMib(int mib)
 #endif
     setup();
 
-    // Qt 3 used 1000 (mib for UCS2) as its identifier for the utf16 codec. Map
-    // this correctly for compatibility.
-    if (mib == 1000)
-        mib = 1015;
+    static QHash <int, QTextCodec *> cache;
+    if (clearCaches & 0x2) {
+        cache.clear();
+        clearCaches &= ~0x2;
+    }
+    QTextCodec *codec = cache.value(mib);
+    if (codec)
+        return codec;
 
     QList<QTextCodec*>::ConstIterator i;
     for (int i = 0; i < all->size(); ++i) {
         QTextCodec *cursor = all->at(i);
-        if (cursor->mibEnum() == mib)
+        if (cursor->mibEnum() == mib) {
+            cache.insert(mib, cursor);
             return cursor;
+        }
     }
 
-    return createForMib(mib);
+    codec = createForMib(mib);
+
+    // Qt 3 used 1000 (mib for UCS2) as its identifier for the utf16 codec. Map
+    // this correctly for compatibility.
+    if (!codec && mib == 1000)
+        return codecForMib(1015);
+
+    if (codec)
+        cache.insert(mib, codec);
+    return codec;
 }
 
 /*!
diff --git a/src/corelib/concurrent/qfuture.h b/src/corelib/concurrent/qfuture.h
index e402335..02ae40a 100644
--- a/src/corelib/concurrent/qfuture.h
+++ b/src/corelib/concurrent/qfuture.h
@@ -111,7 +111,7 @@ public:
     {
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
diff --git a/src/corelib/corelib.pro b/src/corelib/corelib.pro
index 9a15bf1..efee610 100644
--- a/src/corelib/corelib.pro
+++ b/src/corelib/corelib.pro
@@ -35,4 +35,20 @@ symbian: {
     # Workaroud for problems with paging this dll
     MMP_RULES -= PAGED
     MMP_RULES *= UNPAGED
+
+    # Partial upgrade SIS file
+    vendorinfo = \
+        "&EN" \
+        "; Localised Vendor name" \
+        "%{\"Nokia, Qt\"}" \
+        " " \
+        "; Unique Vendor name" \
+        ":\"Nokia, Qt\"" \
+        " "
+    pu_header = "; Partial upgrade package for testing QtCore changes without reinstalling everything" \
+                "$${LITERAL_HASH}{\"Qt corelib\"}, (0x2001E61C), $${QT_MAJOR_VERSION},$${QT_MINOR_VERSION},$${QT_PATCH_VERSION}, TYPE=PU"
+    partial_upgrade.pkg_prerules = pu_header vendorinfo
+    partial_upgrade.sources = qtcore.dll
+    partial_upgrade.path = c:/sys/bin
+    DEPLOYMENT = partial_upgrade $$DEPLOYMENT
 }
diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index 99bbe42..7e7d7d8 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -864,6 +864,9 @@ typedef quint64 qulonglong;
 #  endif
 #endif
 
+#define Q_INIT_RESOURCE_EXTERN(name) \
+    extern int QT_MANGLE_NAMESPACE(qInitResources_ ## name) ();
+
 #define Q_INIT_RESOURCE(name) \
     do { extern int QT_MANGLE_NAMESPACE(qInitResources_ ## name) ();       \
         QT_MANGLE_NAMESPACE(qInitResources_ ## name) (); } while (0)
diff --git a/src/corelib/global/qmalloc.cpp b/src/corelib/global/qmalloc.cpp
index 43e89e3..090998c 100644
--- a/src/corelib/global/qmalloc.cpp
+++ b/src/corelib/global/qmalloc.cpp
@@ -124,3 +124,4 @@ void qFreeAligned(void *ptr)
 }
 
 QT_END_NAMESPACE
+
diff --git a/src/corelib/io/qdatastream.cpp b/src/corelib/io/qdatastream.cpp
index 7c1887e..fc35bfa 100644
--- a/src/corelib/io/qdatastream.cpp
+++ b/src/corelib/io/qdatastream.cpp
@@ -157,6 +157,13 @@ QT_BEGIN_NAMESPACE
     data, followed by the data. Note that any encoding/decoding of
     the data (apart from the length quint32) must be done by you.
 
+    \section1 Reading and writing Qt collection classes
+
+    The Qt collection classes can also be serialized to a QDataStream.
+    These include QList, QLinkedList, QVector, QSet, QHash, and QMap.
+    These classes have have stream operators declared as non-member of
+    the class.    
+
     \target Serializing Qt Classes
     \section1 Reading and writing other Qt classes.
 
diff --git a/src/corelib/io/qfilesystemwatcher_kqueue.cpp b/src/corelib/io/qfilesystemwatcher_kqueue.cpp
index 8396481..99c165e 100644
--- a/src/corelib/io/qfilesystemwatcher_kqueue.cpp
+++ b/src/corelib/io/qfilesystemwatcher_kqueue.cpp
@@ -260,12 +260,22 @@ void QKqueueFileSystemWatcherEngine::run()
 
             DEBUG() << "QKqueueFileSystemWatcherEngine: processing kevent" << kev.ident << kev.filter;
             if (fd == kqpipe[0]) {
-                char c;
-                if (read(kqpipe[0], &c, 1) != 1) {
+                // read all pending data from the pipe
+                QByteArray ba;
+                ba.resize(kev.data);
+                if (read(kqpipe[0], ba.data(), ba.size()) != ba.size()) {
                     perror("QKqueueFileSystemWatcherEngine: error reading from pipe");
                     return;
                 }
-                switch (c) {
+                // read the command from the buffer (but break and return on 'q')
+                char cmd = 0;
+                for (int i = 0; i < ba.size(); ++i) {
+                    cmd = ba.constData()[i];
+                    if (cmd == 'q')
+                        break;
+                }
+                // handle the command
+                switch (cmd) {
                 case 'q':
                     DEBUG() << "QKqueueFileSystemWatcherEngine: thread received 'q', exiting...";
                     return;
@@ -273,7 +283,7 @@ void QKqueueFileSystemWatcherEngine::run()
                     DEBUG() << "QKqueueFileSystemWatcherEngine: thread received '@', continuing...";
                     break;
                 default:
-                    DEBUG() << "QKqueueFileSystemWatcherEngine: thread received unknow message" << c;
+                    DEBUG() << "QKqueueFileSystemWatcherEngine: thread received unknow message" << cmd;
                     break;
                 }
             } else {
diff --git a/src/corelib/io/qfsfileengine_win.cpp b/src/corelib/io/qfsfileengine_win.cpp
index eb99f27..d8b1c03 100644
--- a/src/corelib/io/qfsfileengine_win.cpp
+++ b/src/corelib/io/qfsfileengine_win.cpp
@@ -1479,7 +1479,7 @@ QAbstractFileEngine::FileFlags QFSFileEnginePrivate::getPermissions() const
            {
         //### what to do with permissions if we don't use NTFS
         // for now just add all permissions and what about exe missions ??
-        // also qt_ntfs_permission_lookup is now not set by defualt ... should it ?
+        // also qt_ntfs_permission_lookup is now not set by default ... should it ?
         ret |= QAbstractFileEngine::ReadOtherPerm | QAbstractFileEngine::ReadGroupPerm
             | QAbstractFileEngine::ReadOwnerPerm | QAbstractFileEngine::ReadUserPerm
             | QAbstractFileEngine::WriteUserPerm | QAbstractFileEngine::WriteOwnerPerm
diff --git a/src/corelib/io/qprocess_symbian.cpp b/src/corelib/io/qprocess_symbian.cpp
index 972b0e0..34491d0 100644
--- a/src/corelib/io/qprocess_symbian.cpp
+++ b/src/corelib/io/qprocess_symbian.cpp
@@ -1002,7 +1002,7 @@ bool QProcessPrivate::waitForDeadChild()
             TExitCategoryName catName = symbianProcess->ExitCategory();
             qDebug() << "QProcessPrivate::waitForDeadChild() dead with exitCode"
                      << exitCode << ", crashed:" << crashed
-                     << ", category:" << QString::fromUtf16(catName.Ptr());
+                     << ", category:" << QString((const QChar *)catName.Ptr());
 #endif
         } else {
             QPROCESS_DEBUG_PRINT("QProcessPrivate::waitForDeadChild() not dead!");
diff --git a/src/corelib/kernel/qeventdispatcher_win.cpp b/src/corelib/kernel/qeventdispatcher_win.cpp
index 7c8fb3d..4755540 100644
--- a/src/corelib/kernel/qeventdispatcher_win.cpp
+++ b/src/corelib/kernel/qeventdispatcher_win.cpp
@@ -68,6 +68,14 @@ extern uint qGlobalPostedEventsCount();
 #  define QS_RAWINPUT 0x0400
 #endif
 
+#ifndef WM_TOUCH
+#  define WM_TOUCH 0x0240
+#endif
+#ifndef WM_GESTURE
+#  define WM_GESTURE 0x0119
+#  define WM_GESTURENOTIFY 0x011A
+#endif
+
 enum {
     WM_QT_SOCKETNOTIFIER = WM_USER,
     WM_QT_SENDPOSTEDEVENTS = WM_USER + 1,
@@ -517,8 +525,8 @@ LRESULT CALLBACK qt_GetMessageHook(int code, WPARAM wp, LPARAM lp)
                 MSG *msg = (MSG *) lp;
                 if (localSerialNumber != d->lastSerialNumber
                     // if this message IS the one that triggers sendPostedEvents(), no need to post it again
-                    && msg->hwnd != d->internalHwnd
-                    && msg->message != WM_QT_SENDPOSTEDEVENTS) {
+                    && (msg->hwnd != d->internalHwnd
+                        || msg->message != WM_QT_SENDPOSTEDEVENTS)) {
                     PostMessage(d->internalHwnd, WM_QT_SENDPOSTEDEVENTS, 0, 0);
                 }
             }
@@ -729,6 +737,9 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags)
                             && msg.message <= WM_MOUSELAST)
                         || msg.message == WM_MOUSEWHEEL
                         || msg.message == WM_MOUSEHWHEEL
+                        || msg.message == WM_TOUCH
+                        || msg.message == WM_GESTURE
+                        || msg.message == WM_GESTURENOTIFY
                         || msg.message == WM_CLOSE)) {
                     // queue user input events for later processing
                     haveMessage = false;
diff --git a/src/corelib/tools/qcontiguouscache.h b/src/corelib/tools/qcontiguouscache.h
index 1f7fdb2..f767962 100644
--- a/src/corelib/tools/qcontiguouscache.h
+++ b/src/corelib/tools/qcontiguouscache.h
@@ -97,7 +97,7 @@ public:
     typedef const value_type* const_pointer;
     typedef value_type& reference;
     typedef const value_type& const_reference;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
     typedef int size_type;
 
     explicit QContiguousCache(int capacity = 0);
@@ -221,22 +221,29 @@ void QContiguousCache<T>::setCapacity(int asize)
     x.d->alloc = asize;
     x.d->count = qMin(d->count, asize);
     x.d->offset = d->offset + d->count - x.d->count;
-    x.d->start = x.d->offset % x.d->alloc;
-    T *dest = x.p->array + (x.d->start + x.d->count-1) % x.d->alloc;
-    T *src = p->array + (d->start + d->count-1) % d->alloc;
+    if(asize)
+        x.d->start = x.d->offset % x.d->alloc;
+    else
+        x.d->start = 0;
+
     int oldcount = x.d->count;
-    while (oldcount--) {
-        if (QTypeInfo<T>::isComplex) {
-            new (dest) T(*src);
-        } else {
-            *dest = *src;
+    if(oldcount)
+    {
+        T *dest = x.p->array + (x.d->start + x.d->count-1) % x.d->alloc;
+        T *src = p->array + (d->start + d->count-1) % d->alloc;
+        while (oldcount--) {
+            if (QTypeInfo<T>::isComplex) {
+                new (dest) T(*src);
+            } else {
+                *dest = *src;
+            }
+            if (dest == x.p->array)
+                dest = x.p->array + x.d->alloc;
+            dest--;
+            if (src == p->array)
+                src = p->array + d->alloc;
+            src--;
         }
-        if (dest == x.p->array)
-            dest = x.p->array + x.d->alloc;
-        dest--;
-        if (src == p->array)
-            src = p->array + d->alloc;
-        src--;
     }
     /* free old */
     free(p);
diff --git a/src/corelib/tools/qhash.cpp b/src/corelib/tools/qhash.cpp
index 285f4c9..85a8b63 100644
--- a/src/corelib/tools/qhash.cpp
+++ b/src/corelib/tools/qhash.cpp
@@ -64,13 +64,11 @@ QT_BEGIN_NAMESPACE
 static uint hash(const uchar *p, int n)
 {
     uint h = 0;
-    uint g;
 
     while (n--) {
         h = (h << 4) + *p++;
-        g = h & 0xf0000000;
-        h ^= g >> 23;
-        h &= ~g;
+        h ^= (h & 0xf0000000) >> 23;
+        h &= 0x0fffffff;
     }
     return h;
 }
@@ -78,13 +76,11 @@ static uint hash(const uchar *p, int n)
 static uint hash(const QChar *p, int n)
 {
     uint h = 0;
-    uint g;
 
     while (n--) {
         h = (h << 4) + (*p++).unicode();
-        g = h & 0xf0000000;
-        h ^= g >> 23;
-        h &= ~g;
+        h ^= (h & 0xf0000000) >> 23;
+        h &= 0x0fffffff;
     }
     return h;
 }
diff --git a/src/corelib/tools/qhash.h b/src/corelib/tools/qhash.h
index 2832ca2..f1030ae 100644
--- a/src/corelib/tools/qhash.h
+++ b/src/corelib/tools/qhash.h
@@ -330,7 +330,7 @@ public:
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef T *pointer;
         typedef T &reference;
@@ -395,7 +395,7 @@ public:
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -479,7 +479,7 @@ public:
     // STL compatibility
     typedef T mapped_type;
     typedef Key key_type;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
     typedef int size_type;
 
     inline bool empty() const { return isEmpty(); }
diff --git a/src/corelib/tools/qlinkedlist.h b/src/corelib/tools/qlinkedlist.h
index fe586a4..d145fe3 100644
--- a/src/corelib/tools/qlinkedlist.h
+++ b/src/corelib/tools/qlinkedlist.h
@@ -114,7 +114,7 @@ public:
     {
     public:
         typedef std::bidirectional_iterator_tag  iterator_category;
-        typedef ptrdiff_t  difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef T *pointer;
         typedef T &reference;
@@ -147,7 +147,7 @@ public:
     {
     public:
         typedef std::bidirectional_iterator_tag  iterator_category;
-        typedef ptrdiff_t  difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -213,7 +213,7 @@ public:
     typedef const value_type *const_pointer;
     typedef value_type &reference;
     typedef const value_type &const_reference;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
 
 #ifndef QT_NO_STL
     static inline QLinkedList<T> fromStdList(const std::list<T> &list)
diff --git a/src/corelib/tools/qlist.cpp b/src/corelib/tools/qlist.cpp
index ce62016..6f5bb9b 100644
--- a/src/corelib/tools/qlist.cpp
+++ b/src/corelib/tools/qlist.cpp
@@ -66,6 +66,53 @@ static int grow(int size)
     return x;
 }
 
+/*!
+ *  Detaches the QListData by allocating new memory for a list which will be bigger
+ *  than the copied one and is expected to grow further.
+ *  *idx is the desired insertion point and is clamped to the actual size of the list.
+ *  num is the number of new elements to insert at the insertion point.
+ *  Returns the old (shared) data, it is up to the caller to deref() and free().
+ *  For the new data node_copy needs to be called.
+ *
+ *  \internal
+ */
+QListData::Data *QListData::detach_grow(int *idx, int num)
+{
+    Data *x = d;
+    int l = x->end - x->begin;
+    int nl = l + num;
+    int alloc = grow(nl);
+    Data* t = static_cast<Data *>(qMalloc(DataHeaderSize + alloc * sizeof(void *)));
+    Q_CHECK_PTR(t);
+
+    t->ref = 1;
+    t->sharable = true;
+    t->alloc = alloc;
+    // The space reservation algorithm's optimization is biased towards appending:
+    // Something which looks like an append will put the data at the beginning,
+    // while something which looks like a prepend will put it in the middle
+    // instead of at the end. That's based on the assumption that prepending
+    // is uncommon and even an initial prepend will eventually be followed by
+    // at least some appends.
+    int bg;
+    if (*idx < 0) {
+        *idx = 0;
+        bg = (alloc - nl) >> 1;
+    } else if (*idx > l) {
+        *idx = l;
+        bg = 0;
+    } else if (*idx < (l >> 1)) {
+        bg = (alloc - nl) >> 1;
+    } else {
+        bg = 0;
+    }
+    t->begin = bg;
+    t->end = bg + nl;
+    d = t;
+
+    return x;
+}
+
 #if QT_VERSION >= 0x050000
 #  error "Remove QListData::detach(), it is only required for binary compatibility for 4.0.x to 4.2.x"
 #endif
@@ -125,22 +172,23 @@ QListData::Data *QListData::detach2()
 }
 
 /*!
- *  Detaches the QListData by reallocating new memory.
+ *  Detaches the QListData by allocating new memory for a list which possibly
+ *  has a different size than the copied one.
  *  Returns the old (shared) data, it is up to the caller to deref() and free()
  *  For the new data node_copy needs to be called.
  *
  *  \internal
  */
-QListData::Data *QListData::detach3()
+QListData::Data *QListData::detach(int alloc)
 {
     Data *x = d;
-    Data* t = static_cast<Data *>(qMalloc(DataHeaderSize + x->alloc * sizeof(void *)));
+    Data* t = static_cast<Data *>(qMalloc(DataHeaderSize + alloc * sizeof(void *)));
     Q_CHECK_PTR(t);
 
     t->ref = 1;
     t->sharable = true;
-    t->alloc = x->alloc;
-    if (!t->alloc) {
+    t->alloc = alloc;
+    if (!alloc) {
         t->begin = 0;
         t->end = 0;
     } else {
@@ -152,6 +200,21 @@ QListData::Data *QListData::detach3()
     return x;
 }
 
+/*!
+ *  Detaches the QListData by reallocating new memory.
+ *  Returns the old (shared) data, it is up to the caller to deref() and free()
+ *  For the new data node_copy needs to be called.
+ *
+ *  \internal
+ */
+#if QT_VERSION >= 0x050000
+#  error "Remove QListData::detach3(), it is only required for binary compatibility for 4.5.x to 4.6.x"
+#endif
+QListData::Data *QListData::detach3()
+{
+    return detach(d->alloc);
+}
+
 void QListData::realloc(int alloc)
 {
     Q_ASSERT(d->ref == 1);
@@ -164,22 +227,30 @@ void QListData::realloc(int alloc)
         d->begin = d->end = 0;
 }
 
-// ensures that enough space is available to append one element
-void **QListData::append()
+// ensures that enough space is available to append n elements
+void **QListData::append(int n)
 {
     Q_ASSERT(d->ref == 1);
-    if (d->end == d->alloc) {
-        int n = d->end - d->begin;
-        if (d->begin > 2 * d->alloc / 3) {
+    int e = d->end;
+    if (e + n > d->alloc) {
+        int b = d->begin;
+        if (b - n >= 2 * d->alloc / 3) {
             // we have enough space. Just not at the end -> move it.
-            ::memcpy(d->array + n, d->array + d->begin, n * sizeof(void *));
-            d->begin = n;
-            d->end = n * 2;
+            e -= b;
+            ::memcpy(d->array, d->array + b, e * sizeof(void *));
+            d->begin = 0;
         } else {
-            realloc(grow(d->alloc + 1));
+            realloc(grow(d->alloc + n));
         }
     }
-    return d->array + d->end++;
+    d->end = e + n;
+    return d->array + e;
+}
+
+// ensures that enough space is available to append one element
+void **QListData::append()
+{
+    return append(1);
 }
 
 // ensures that enough space is available to append the list
@@ -193,7 +264,7 @@ void **QListData::append(const QListData& l)
     int n = l.d->end - l.d->begin;
     if (n) {
         if (e + n > d->alloc)
-            realloc(grow(e + l.d->end - l.d->begin));
+            realloc(grow(e + n));
         ::memcpy(d->array + d->end, l.d->array + l.d->begin, n*sizeof(void*));
         d->end += n;
     }
@@ -203,15 +274,7 @@ void **QListData::append(const QListData& l)
 // ensures that enough space is available to append the list
 void **QListData::append2(const QListData& l)
 {
-    Q_ASSERT(d->ref == 1);
-    int e = d->end;
-    int n = l.d->end - l.d->begin;
-    if (n) {
-        if (e + n > d->alloc)
-            realloc(grow(e + n));
-        d->end += n;
-    }
-    return d->array + e;
+    return append(l.d->end - l.d->begin);
 }
 
 void **QListData::prepend()
@@ -237,11 +300,11 @@ void **QListData::insert(int i)
     Q_ASSERT(d->ref == 1);
     if (i <= 0)
         return prepend();
-    if (i >= d->end - d->begin)
+    int size = d->end - d->begin;
+    if (i >= size)
         return append();
 
     bool leftward = false;
-    int size = d->end - d->begin;
 
     if (d->begin == 0) {
         if (d->end == d->alloc) {
@@ -647,6 +710,19 @@ void **QListData::erase(void **xi)
     Same as at().
 */
 
+/*! \fn QList::reserve(int alloc)
+
+    Reserve space for \a alloc elements.
+
+    If \a alloc is smaller than the current size of the list, nothing will happen.
+
+    Use this function to avoid repetetive reallocation of QList's internal
+    data if you can predict how many elements will be appended.
+    Note that the reservation applies only to the internal pointer array.
+
+    \since 4.7
+*/
+
 /*! \fn void QList::append(const T &value)
 
     Inserts \a value at the end of the list.
diff --git a/src/corelib/tools/qlist.h b/src/corelib/tools/qlist.h
index 1d08c41..3a29e13 100644
--- a/src/corelib/tools/qlist.h
+++ b/src/corelib/tools/qlist.h
@@ -52,6 +52,7 @@
 #endif
 
 #include <new>
+#include <limits.h>
 #include <string.h>
 
 QT_BEGIN_HEADER
@@ -72,13 +73,16 @@ struct Q_CORE_EXPORT QListData {
     };
     enum { DataHeaderSize = sizeof(Data) - sizeof(void *) };
 
+    Data *detach(int alloc);
+    Data *detach_grow(int *i, int n);
     Data *detach(); // remove in 5.0
     Data *detach2(); // remove in 5.0
-    Data *detach3();
+    Data *detach3(); // remove in 5.0
     void realloc(int alloc);
     static Data shared_null;
     Data *d;
     void **erase(void **xi);
+    void **append(int n);
     void **append();
     void **append(const QListData &l);
     void **append2(const QListData &l); // remove in 5.0
@@ -94,6 +98,25 @@ struct Q_CORE_EXPORT QListData {
     inline void **end() const { return d->array + d->end; }
 };
 
+//////////////////////////////////////////////////////////////////////////////////
+//
+// QtPodForSize and QtPodForType are internal and may change or go away any time.
+// We mean it.
+//
+//////////////////////////////////////////////////////////////////////////////////
+template <int N> struct QtPodForSize {
+    // This base type is rather obviously broken and cannot be made
+    // working due to alignment constraints.
+    // This doesn't matter as far as QList is concerned, as we are
+    // using this type only for QTypeInfo<T>::isLarge == false.
+    typedef struct { } Type;
+};
+template <> struct QtPodForSize<1> { typedef quint8  Type; };
+template <> struct QtPodForSize<2> { typedef quint16 Type; };
+template <> struct QtPodForSize<4> { typedef quint32 Type; };
+template <> struct QtPodForSize<8> { typedef quint64 Type; };
+template <class T> struct QtPodForType : QtPodForSize<sizeof(T)> { };
+
 template <typename T>
 class QList
 {
@@ -140,6 +163,7 @@ public:
     const T &operator[](int i) const;
     T &operator[](int i);
 
+    void reserve(int size);
     void append(const T &t);
     void append(const QList<T> &t);
     void prepend(const T &t);
@@ -164,7 +188,7 @@ public:
     public:
         Node *i;
         typedef std::random_access_iterator_tag  iterator_category;
-        typedef ptrdiff_t  difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef T *pointer;
         typedef T &reference;
@@ -211,7 +235,7 @@ public:
     public:
         Node *i;
         typedef std::random_access_iterator_tag  iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -290,7 +314,7 @@ public:
     typedef const value_type *const_pointer;
     typedef value_type &reference;
     typedef const value_type &const_reference;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
 
 #ifdef QT3_SUPPORT
     inline QT3_SUPPORT iterator remove(iterator pos) { return erase(pos); }
@@ -331,6 +355,8 @@ public:
 #endif
 
 private:
+    Node *detach_helper_grow(int i, int n);
+    void detach_helper(int alloc);
     void detach_helper();
     void free(QListData::Data *d);
 
@@ -464,11 +490,21 @@ inline T QList<T>::takeLast()
 { T t = last(); removeLast(); return t; }
 
 template <typename T>
+Q_OUTOFLINE_TEMPLATE void QList<T>::reserve(int alloc)
+{
+    if (d->alloc < alloc) {
+        if (d->ref != 1)
+            detach_helper(alloc);
+        else
+            p.realloc(alloc);
+    }
+}
+
+template <typename T>
 Q_OUTOFLINE_TEMPLATE void QList<T>::append(const T &t)
 {
-    detach();
-    if (QTypeInfo<T>::isLarge || QTypeInfo<T>::isStatic) {
-        Node *n = reinterpret_cast<Node *>(p.append());
+    if (d->ref != 1) {
+        Node *n = detach_helper_grow(INT_MAX, 1);
         QT_TRY {
             node_construct(n, t);
         } QT_CATCH(...) {
@@ -476,13 +512,24 @@ Q_OUTOFLINE_TEMPLATE void QList<T>::append(const T &t)
             QT_RETHROW;
         }
     } else {
-        const T cpy(t);
-        Node *n = reinterpret_cast<Node *>(p.append());
-        QT_TRY {
-            node_construct(n, cpy);
-        } QT_CATCH(...) {
-            --d->end;
-            QT_RETHROW;
+        if (QTypeInfo<T>::isLarge || QTypeInfo<T>::isStatic) {
+            Node *n = reinterpret_cast<Node *>(p.append());
+            QT_TRY {
+                node_construct(n, t);
+            } QT_CATCH(...) {
+                --d->end;
+                QT_RETHROW;
+            }
+        } else {
+            typedef typename QtPodForType<T>::Type PodNode;
+            PodNode cpy = *reinterpret_cast<const PodNode *>(&t);
+            Node *n = reinterpret_cast<Node *>(p.append());
+            QT_TRY {
+                node_construct(n, *reinterpret_cast<const T *>(&cpy));
+            } QT_CATCH(...) {
+                --d->end;
+                QT_RETHROW;
+            }
         }
     }
 }
@@ -490,9 +537,8 @@ Q_OUTOFLINE_TEMPLATE void QList<T>::append(const T &t)
 template <typename T>
 inline void QList<T>::prepend(const T &t)
 {
-    detach();
-    if (QTypeInfo<T>::isLarge || QTypeInfo<T>::isStatic) {
-        Node *n = reinterpret_cast<Node *>(p.prepend());
+    if (d->ref != 1) {
+        Node *n = detach_helper_grow(0, 1);
         QT_TRY {
             node_construct(n, t);
         } QT_CATCH(...) {
@@ -500,13 +546,24 @@ inline void QList<T>::prepend(const T &t)
             QT_RETHROW;
         }
     } else {
-        const T cpy(t);
-        Node *n = reinterpret_cast<Node *>(p.prepend());
-        QT_TRY {
-            node_construct(n, cpy);
-        } QT_CATCH(...) {
-            ++d->begin;
-            QT_RETHROW;
+        if (QTypeInfo<T>::isLarge || QTypeInfo<T>::isStatic) {
+            Node *n = reinterpret_cast<Node *>(p.prepend());
+            QT_TRY {
+                node_construct(n, t);
+            } QT_CATCH(...) {
+                ++d->begin;
+                QT_RETHROW;
+            }
+        } else {
+            typedef typename QtPodForType<T>::Type PodNode;
+            PodNode cpy = *reinterpret_cast<const PodNode *>(&t);
+            Node *n = reinterpret_cast<Node *>(p.prepend());
+            QT_TRY {
+                node_construct(n, *reinterpret_cast<const T *>(&cpy));
+            } QT_CATCH(...) {
+                ++d->begin;
+                QT_RETHROW;
+            }
         }
     }
 }
@@ -514,9 +571,8 @@ inline void QList<T>::prepend(const T &t)
 template <typename T>
 inline void QList<T>::insert(int i, const T &t)
 {
-    detach();
-    if (QTypeInfo<T>::isLarge || QTypeInfo<T>::isStatic) {
-        Node *n = reinterpret_cast<Node *>(p.insert(i));
+    if (d->ref != 1) {
+        Node *n = detach_helper_grow(i, 1);
         QT_TRY {
             node_construct(n, t);
         } QT_CATCH(...) {
@@ -524,13 +580,24 @@ inline void QList<T>::insert(int i, const T &t)
             QT_RETHROW;
         }
     } else {
-        const T cpy(t);
-        Node *n = reinterpret_cast<Node *>(p.insert(i));
-        QT_TRY {
-            node_construct(n, cpy);
-        } QT_CATCH(...) {
-            p.remove(i);
-            QT_RETHROW;
+        if (QTypeInfo<T>::isLarge || QTypeInfo<T>::isStatic) {
+            Node *n = reinterpret_cast<Node *>(p.insert(i));
+            QT_TRY {
+                node_construct(n, t);
+            } QT_CATCH(...) {
+                p.remove(i);
+                QT_RETHROW;
+            }
+        } else {
+            typedef typename QtPodForType<T>::Type PodNode;
+            PodNode cpy = *reinterpret_cast<const PodNode *>(&t);
+            Node *n = reinterpret_cast<Node *>(p.insert(i));
+            QT_TRY {
+                node_construct(n, *reinterpret_cast<const T *>(&cpy));
+            } QT_CATCH(...) {
+                p.remove(i);
+                QT_RETHROW;
+            }
         }
     }
 }
@@ -540,12 +607,7 @@ inline void QList<T>::replace(int i, const T &t)
 {
     Q_ASSERT_X(i >= 0 && i < p.size(), "QList<T>::replace", "index out of range");
     detach();
-    if (QTypeInfo<T>::isLarge || QTypeInfo<T>::isStatic) {
-        reinterpret_cast<Node *>(p.at(i))->t() = t;
-    } else {
-        const T cpy(t);
-        reinterpret_cast<Node *>(p.at(i))->t() = cpy;
-    }
+    reinterpret_cast<Node *>(p.at(i))->t() = t;
 }
 
 template <typename T>
@@ -575,11 +637,20 @@ Q_OUTOFLINE_TEMPLATE QList<T> QList<T>::mid(int pos, int alength) const
         alength = size() - pos;
     if (pos == 0 && alength == size())
         return *this;
-    QList<T> cpy;
     if (pos + alength > size())
         alength = size() - pos;
-    for (int i = pos; i < pos + alength; ++i)
-        cpy += at(i);
+    QList<T> cpy;
+    cpy.reserve(alength);
+    cpy.d->end = alength;
+    QT_TRY {
+        cpy.node_copy(reinterpret_cast<Node *>(cpy.p.begin()),
+                      reinterpret_cast<Node *>(cpy.p.end()),
+                      reinterpret_cast<Node *>(p.begin() + pos));
+    } QT_CATCH(...) {
+        // restore the old end
+        cpy.d->end = 0;
+        QT_RETHROW;
+    }
     return cpy;
 }
 
@@ -599,10 +670,40 @@ Q_OUTOFLINE_TEMPLATE T QList<T>::value(int i, const T& defaultValue) const
 }
 
 template <typename T>
-Q_OUTOFLINE_TEMPLATE void QList<T>::detach_helper()
+Q_OUTOFLINE_TEMPLATE typename QList<T>::Node *QList<T>::detach_helper_grow(int i, int c)
+{
+    Node *n = reinterpret_cast<Node *>(p.begin());
+    QListData::Data *x = p.detach_grow(&i, c);
+    QT_TRY {
+        node_copy(reinterpret_cast<Node *>(p.begin()),
+                  reinterpret_cast<Node *>(p.begin() + i), n);
+    } QT_CATCH(...) {
+        qFree(d);
+        d = x;
+        QT_RETHROW;
+    }
+    QT_TRY {
+        node_copy(reinterpret_cast<Node *>(p.begin() + i + c),
+                  reinterpret_cast<Node *>(p.end()), n + i);
+    } QT_CATCH(...) {
+        node_destruct(reinterpret_cast<Node *>(p.begin()),
+                      reinterpret_cast<Node *>(p.begin() + i));
+        qFree(d);
+        d = x;
+        QT_RETHROW;
+    }
+
+    if (!x->ref.deref())
+        free(x);
+
+    return reinterpret_cast<Node *>(p.begin() + i);
+}
+
+template <typename T>
+Q_OUTOFLINE_TEMPLATE void QList<T>::detach_helper(int alloc)
 {
     Node *n = reinterpret_cast<Node *>(p.begin());
-    QListData::Data *x = p.detach3();
+    QListData::Data *x = p.detach(alloc);
     QT_TRY {
         node_copy(reinterpret_cast<Node *>(p.begin()), reinterpret_cast<Node *>(p.end()), n);
     } QT_CATCH(...) {
@@ -616,6 +717,12 @@ Q_OUTOFLINE_TEMPLATE void QList<T>::detach_helper()
 }
 
 template <typename T>
+Q_OUTOFLINE_TEMPLATE void QList<T>::detach_helper()
+{
+    detach_helper(d->alloc);
+}
+
+template <typename T>
 Q_OUTOFLINE_TEMPLATE QList<T>::~QList()
 {
     if (d && !d->ref.deref())
@@ -701,8 +808,9 @@ Q_OUTOFLINE_TEMPLATE typename QList<T>::iterator QList<T>::erase(typename QList<
 template <typename T>
 Q_OUTOFLINE_TEMPLATE QList<T> &QList<T>::operator+=(const QList<T> &l)
 {
-    detach();
-    Node *n = reinterpret_cast<Node *>(p.append2(l.p));
+    Node *n = (d->ref != 1)
+              ? detach_helper_grow(INT_MAX, l.size())
+              : reinterpret_cast<Node *>(p.append2(l.p));
     QT_TRY{
         node_copy(n, reinterpret_cast<Node *>(p.end()), reinterpret_cast<Node *>(l.p.begin()));
     } QT_CATCH(...) {
diff --git a/src/corelib/tools/qmap.h b/src/corelib/tools/qmap.h
index 9ba9ca5..2e21547 100644
--- a/src/corelib/tools/qmap.h
+++ b/src/corelib/tools/qmap.h
@@ -214,7 +214,7 @@ public:
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef T *pointer;
         typedef T &reference;
@@ -282,7 +282,7 @@ public:
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -385,7 +385,7 @@ public:
     // STL compatibility
     typedef Key key_type;
     typedef T mapped_type;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
     typedef int size_type;
     inline bool empty() const { return isEmpty(); }
 
diff --git a/src/corelib/tools/qset.h b/src/corelib/tools/qset.h
index 6525880..fe50d4d 100644
--- a/src/corelib/tools/qset.h
+++ b/src/corelib/tools/qset.h
@@ -97,7 +97,7 @@ public:
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -132,7 +132,7 @@ public:
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -188,11 +188,10 @@ public:
     typedef const value_type *const_pointer;
     typedef value_type &reference;
     typedef const value_type &const_reference;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
     typedef int size_type;
 
     inline bool empty() const { return isEmpty(); }
-
     // comfort
     inline QSet<T> &operator<<(const T &value) { insert(value); return *this; }
     inline QSet<T> &operator|=(const QSet<T> &other) { unite(other); return *this; }
@@ -292,6 +291,7 @@ template <typename T>
 Q_OUTOFLINE_TEMPLATE QList<T> QSet<T>::toList() const
 {
     QList<T> result;
+    result.reserve(size());
     typename QSet<T>::const_iterator i = constBegin();
     while (i != constEnd()) {
         result.append(*i);
diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
index 0dcea5f..d85c248 100644
--- a/src/corelib/tools/qsharedpointer_impl.h
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -132,7 +132,7 @@ namespace QtSharedPointer {
         typedef const value_type *const_pointer;
         typedef value_type &reference;
         typedef const value_type &const_reference;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
 
         inline T *data() const { return value; }
         inline bool isNull() const { return !data(); }
@@ -541,7 +541,7 @@ public:
     typedef const value_type *const_pointer;
     typedef value_type &reference;
     typedef const value_type &const_reference;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
 
     inline bool isNull() const { return d == 0 || d->strongref == 0 || value == 0; }
 #ifndef Q_CC_NOKIAX86
diff --git a/src/corelib/tools/qstring.cpp b/src/corelib/tools/qstring.cpp
index dec59b7..ac1bee7 100644
--- a/src/corelib/tools/qstring.cpp
+++ b/src/corelib/tools/qstring.cpp
@@ -989,6 +989,40 @@ QString::QString(const QChar *unicode, int size)
     }
 }
 
+/*!
+    \since 4.7
+
+    Constructs a string initialized with the characters of the QChar array
+    \a unicode, which must be terminated with a 0.
+
+    QString makes a deep copy of the string data. The unicode data is copied as
+    is and the Byte Order Mark is preserved if present.
+*/
+QString::QString(const QChar *unicode)
+{
+     if (!unicode) {
+         d = &shared_null;
+         d->ref.ref();
+     } else {
+         int size = 0;
+         while (unicode[size] != 0)
+             ++size;
+         if (!size) {
+             d = &shared_empty;
+             d->ref.ref();
+         } else {
+             d = (Data*) qMalloc(sizeof(Data)+size*sizeof(QChar));
+             Q_CHECK_PTR(d);
+             d->ref = 1;
+             d->alloc = d->size = size;
+             d->clean = d->asciiCache = d->simpletext = d->righttoleft = d->capacity = 0;
+             d->data = d->array;
+             memcpy(d->array, unicode, size * sizeof(QChar));
+             d->array[size] = '\0';
+         }
+     }
+}
+
 
 /*!
     Constructs a string of the given \a size with every character set
@@ -1766,13 +1800,14 @@ void QString::replace_helper(uint *indices, int nIndices, int blen, const QChar
     }
 
     QT_TRY {
-        detach();
         if (blen == alen) {
             // replace in place
+            detach();
             for (int i = 0; i < nIndices; ++i)
                 memcpy(d->data + indices[i], afterBuffer, alen * sizeof(QChar));
         } else if (alen < blen) {
             // replace from front
+            detach();
             uint to = indices[0];
             if (alen)
                 memcpy(d->data+to, after, alen*sizeof(QChar));
@@ -3867,7 +3902,7 @@ QString QString::fromUtf8(const char *str, int size)
     host byte order is assumed.
 
     This function is comparatively slow.
-    Use QString(const ushort *, int) if possible.
+    Use QString(const ushort *, int) or QString(const ushort *) if possible.
 
     QString makes a deep copy of the Unicode data.
 
@@ -3960,24 +3995,74 @@ QString QString::simplified() const
 {
     if (d->size == 0)
         return *this;
-    QString result(d->size, Qt::Uninitialized);
-    const QChar *from = (const QChar*) d->data;
-    const QChar *fromend = (const QChar*) from+d->size;
-    int outc=0;
-    QChar *to   = (QChar*) result.d->data;
-    for (;;) {
-        while (from!=fromend && from->isSpace())
-            from++;
-        while (from!=fromend && !from->isSpace())
-            to[outc++] = *from++;
-        if (from!=fromend)
-            to[outc++] = QLatin1Char(' ');
-        else
+
+    const QChar * const start = reinterpret_cast<QChar *>(d->data);
+    const QChar *from = start;
+    const QChar *fromEnd = start + d->size;
+    forever {
+        QChar ch = *from;
+        if (!ch.isSpace())
             break;
+        if (++from == fromEnd) {
+            // All-whitespace string
+            shared_empty.ref.ref();
+            return QString(&shared_empty, 0);
+        }
+    }
+    // This loop needs no underflow check, as we already determined that
+    // the string contains non-whitespace. If the string has exactly one
+    // non-whitespace, it will be checked twice - we can live with that.
+    while (fromEnd[-1].isSpace())
+        fromEnd--;
+    // The rest of the function depends on the fact that we already know
+    // that the last character in the source is no whitespace.
+    const QChar *copyFrom = from;
+    int copyCount;
+    forever {
+        if (++from == fromEnd) {
+            // Only leading and/or trailing whitespace, if any at all
+            return mid(copyFrom - start, from - copyFrom);
+        }
+        QChar ch = *from;
+        if (!ch.isSpace())
+            continue;
+        if (ch != QLatin1Char(' ')) {
+            copyCount = from - copyFrom;
+            break;
+        }
+        ch = *++from;
+        if (ch.isSpace()) {
+            copyCount = from - copyFrom - 1;
+            break;
+        }
+    }
+    // 'from' now points at the non-trailing whitespace which made the
+    // string not simplified in the first place. 'copyCount' is the number
+    // of already simplified characters - at least one, obviously -
+    // without a trailing space.
+    QString result((fromEnd - from) + copyCount, Qt::Uninitialized);
+    QChar *to = reinterpret_cast<QChar *>(result.d->data);
+    ::memcpy(to, copyFrom, copyCount * 2);
+    to += copyCount;
+    fromEnd--;
+    QChar ch;
+    forever {
+        *to++ = QLatin1Char(' ');
+        do {
+            ch = *++from;
+        } while (ch.isSpace());
+        if (from == fromEnd)
+            break;
+        do {
+            *to++ = ch;
+            ch = *++from;
+            if (from == fromEnd)
+                goto done;
+        } while (!ch.isSpace());
     }
-    if (outc > 0 && to[outc-1] == QLatin1Char(' '))
-        outc--;
-    result.truncate(outc);
+  done:
+    *to++ = ch;
+    result.truncate(to - reinterpret_cast<QChar *>(result.d->data));
     return result;
 }
 
diff --git a/src/corelib/tools/qstring.h b/src/corelib/tools/qstring.h
index 702a21a..8de3c7d 100644
--- a/src/corelib/tools/qstring.h
+++ b/src/corelib/tools/qstring.h
@@ -91,7 +91,8 @@ class Q_CORE_EXPORT QString
 {
 public:
     inline QString();
-    QString(const QChar *unicode, int size);
+    QString(const QChar *unicode, int size); // Qt5: don't cap size < 0
+    explicit QString(const QChar *unicode); // Qt5: merge with the above
     QString(QChar c);
     QString(int size, QChar c);
     inline QString(const QLatin1String &latin1);
diff --git a/src/corelib/tools/qvector.h b/src/corelib/tools/qvector.h
index 61b22fd..c2e2485 100644
--- a/src/corelib/tools/qvector.h
+++ b/src/corelib/tools/qvector.h
@@ -164,7 +164,7 @@ public:
     public:
         T *i;
         typedef std::random_access_iterator_tag  iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef T *pointer;
         typedef T &reference;
@@ -197,7 +197,7 @@ public:
     public:
         T *i;
         typedef std::random_access_iterator_tag  iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -261,7 +261,7 @@ public:
     typedef const value_type* const_pointer;
     typedef value_type& reference;
     typedef const value_type& const_reference;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
     typedef iterator Iterator;
     typedef const_iterator ConstIterator;
     typedef int size_type;
@@ -728,9 +728,10 @@ Q_OUTOFLINE_TEMPLATE QVector<T> QVector<T>::mid(int pos, int length) const
         length = size() - pos;
     if (pos == 0 && length == size())
         return *this;
-    QVector<T> copy;
     if (pos + length > size())
         length = size() - pos;
+    QVector<T> copy;
+    copy.reserve(length);
     for (int i = pos; i < pos + length; ++i)
         copy += at(i);
     return copy;
@@ -740,6 +741,7 @@ template <typename T>
 Q_OUTOFLINE_TEMPLATE QList<T> QVector<T>::toList() const
 {
     QList<T> result;
+    result.reserve(size());
     for (int i = 0; i < size(); ++i)
         result.append(at(i));
     return result;
diff --git a/src/corelib/xml/qxmlstream_p.h b/src/corelib/xml/qxmlstream_p.h
index 6b911d2..ac421cf 100644
--- a/src/corelib/xml/qxmlstream_p.h
+++ b/src/corelib/xml/qxmlstream_p.h
@@ -54,7 +54,7 @@
 #ifndef QXMLSTREAM_P_H
 #define QXMLSTREAM_P_H
 
-#if defined(Q_OS_VXWORKS) && defined(ERROR)
+#if defined(ERROR)
 #  undef ERROR
 #endif