Merge remote-tracking branch 'origin/4.7' into qt-4.8-from-4.7

Conflicts:
	src/gui/painting/qpainterpath.cpp
	src/gui/text/qfontengine_ft.cpp
	src/s60installs/eabi/QtGuiu.def

1 files changed, 20 insertions, 0 deletions

diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index 80d7b85..69ec0bd 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -299,6 +299,7 @@ QWidgetPrivate::QWidgetPrivate(int version)
 #ifndef QT_NO_IM
       , inheritsInputMethodHints(0)
 #endif
+      , inSetParent(0)
 #if defined(Q_WS_X11)
       , picture(0)
 #elif defined(Q_WS_WIN)
@@ -2599,6 +2600,22 @@ WId QWidget::effectiveWinId() const
     if (id || !testAttribute(Qt::WA_WState_Created))
         return id;
     QWidget *realParent = nativeParentWidget();
+    if (!realParent && d_func()->inSetParent) {
+        // In transitional state. This is really just a workaround. The real problem
+        // is that QWidgetPrivate::setParent_sys (platform specific code) first sets
+        // the window id to 0 (setWinId(0)) before it sets the Qt::WA_WState_Created
+        // attribute to false. The correct way is to do it the other way around, and
+        // in that case the Qt::WA_WState_Created logic above will kick in and
+        // return 0 whenever the widget is in a transitional state. However, changing
+        // the original logic for all platforms is far more intrusive and might
+        // break existing applications.
+        // Note: The widget can only be in a transitional state when changing its
+        // parent -- everything else is an internal error -- hence explicitly checking
+        // against 'inSetParent' rather than doing an unconditional return whenever
+        // 'realParent' is 0 (which may cause strange artifacts and headache later).
+        return 0;
+    }
+    // This widget *must* have a native parent widget.
     Q_ASSERT(realParent);
     Q_ASSERT(realParent->internalWinId());
     return realParent->internalWinId();
@@ -10111,6 +10128,7 @@ void QWidget::setParent(QWidget *parent)
 void QWidget::setParent(QWidget *parent, Qt::WindowFlags f)
 {
     Q_D(QWidget);
+    d->inSetParent = true;
     bool resized = testAttribute(Qt::WA_Resized);
     bool wasCreated = testAttribute(Qt::WA_WState_Created);
     QWidget *oldtlw = window();
@@ -10271,6 +10289,8 @@ void QWidget::setParent(QWidget *parent, Qt::WindowFlags f)
             ancestorProxy->d_func()->embedSubWindow(this);
     }
 #endif
+
+    d->inSetParent = false;
 }
 
 /*!