ShortcutOverride has no effect on some shortcuts on Mac OS X (Cocoa).

When generating the native key sequences for menu items, Qt prefers the
non private unicode characters. But the characters in the NSEvent for
keyboard events can contain characters form the unicode range reserved
for Apple.
For e.g. when user presses the "delete" key, the event contains
NSDeleteFunctionKey, where in Qt is expecting NSDeleteCharacter. For now
this is the only key identified for translation. If we find similar
translations, those can be added to qt_mac_removePrivateUnicode().

Task-number: QTBUG-12495
Reviewed-by: Denis

2 files changed, 36 insertions, 8 deletions

diff --git a/src/gui/kernel/qt_cocoa_helpers_mac.mm b/src/gui/kernel/qt_cocoa_helpers_mac.mm
index 5a522f9..48d21e9 100644
--- a/src/gui/kernel/qt_cocoa_helpers_mac.mm
+++ b/src/gui/kernel/qt_cocoa_helpers_mac.mm
@@ -79,6 +79,7 @@
 #include <qdesktopwidget.h>
 #include <qevent.h>
 #include <qpixmapcache.h>
+#include <qvarlengtharray.h>
 #include <private/qevent_p.h>
 #include <private/qt_cocoa_helpers_mac_p.h>
 #include <private/qt_mac_p.h>
@@ -616,6 +617,27 @@ Qt::KeyboardModifiers qt_cocoaModifiers2QtModifiers(ulong modifierFlags)
     return qtMods;
 }
 
+NSString *qt_mac_removePrivateUnicode(NSString* string)
+{
+    int len = [string length];
+    if (len) {
+        QVarLengthArray <unichar, 10> characters(len);
+        bool changed = false;
+        for (int i = 0; i<len; i++) {
+            characters[i] = [string characterAtIndex:i];
+            // check if they belong to key codes in private unicode range
+            // currently we need to handle only the NSDeleteFunctionKey
+            if (characters[i] == NSDeleteFunctionKey) {
+                characters[i] = NSDeleteCharacter;
+                changed = true;
+            }
+        }
+        if (changed)
+            return [NSString stringWithCharacters:characters.data() length:len];
+    }
+    return string;
+}
+
 Qt::KeyboardModifiers qt_cocoaDragOperation2QtModifiers(uint dragOperations)
 {
     Qt::KeyboardModifiers qtMods =Qt::NoModifier;
diff --git a/src/gui/widgets/qcocoamenu_mac.mm b/src/gui/widgets/qcocoamenu_mac.mm
index 15fae23..b670186 100644
--- a/src/gui/widgets/qcocoamenu_mac.mm
+++ b/src/gui/widgets/qcocoamenu_mac.mm
@@ -156,10 +156,14 @@ QT_USE_NAMESPACE
     // In every other case we return NO, which means that Cocoa can do as it pleases
     // (i.e., fire the menu action).
     NSMenuItem *whichItem;
+    // Change the private unicode keys to the ones used in setting the "Key Equivalents"
+    extern NSString *qt_mac_removePrivateUnicode(NSString* string);
+    NSString *characters = qt_mac_removePrivateUnicode([event characters]);
     if ([self hasShortcut:menu
-                   forKey:[event characters]
-             forModifiers:([event modifierFlags] & NSDeviceIndependentModifierFlagsMask)
-                 whichItem:&whichItem]) {
+            forKey:characters
+            // Interested only in Shift, Cmd, Ctrl & Alt Keys, so ignoring masks like, Caps lock, Num Lock ...
+            forModifiers:([event modifierFlags] & (NSShiftKeyMask | NSControlKeyMask | NSCommandKeyMask | NSAlternateKeyMask))
+            whichItem:&whichItem]) {
         QWidget *widget = 0;
         QAction *qaction = 0;
         if (whichItem && [whichItem tag]) {
@@ -170,6 +174,9 @@ QT_USE_NAMESPACE
                       qApp->activePopupWidget()->focusWidget() : qApp->activePopupWidget());
         else if (QApplicationPrivate::focus_widget)
             widget = QApplicationPrivate::focus_widget;
+        // If we could not find any receivers, pass it to the active window
+        if (!widget)
+            widget = qApp->activeWindow();
         if (qaction && widget) {
             int key = qaction->shortcut();
             QKeyEvent accel_ev(QEvent::ShortcutOverride, (key & (~Qt::KeyboardModifierMask)),
@@ -177,11 +184,10 @@ QT_USE_NAMESPACE
             accel_ev.ignore();
             qt_sendSpontaneousEvent(widget, &accel_ev);
             if (accel_ev.isAccepted()) {
-                if (qt_dispatchKeyEvent(event, widget)) {
-                    *target = nil;
-                    *action = nil;
-                    return YES;
-                }
+                qt_dispatchKeyEvent(event, widget);
+                *target = nil;
+                *action = nil;
+                return YES;
             }
         }
     }