Shortcut overriding in line edits on OS X is broken

On OS X QLineEdit does not override the Cmd+Left, Cmd+Right shortcuts. This is because OS X sends the KeypadModifier as well as the ControlModifier when pressing those keys. The code in QWidgetLineControl::processShortcutOverrideEvent only accepts the override event if modiifers() == Qt.ControlModifier, thereby failing on OS X (the code checks for equality with the well known shortcuts which are defined as Control+Left and Control+Right).

The bug probably affects other shortcuts as well, but those were the ones I tested.

The fix is either to filter out the keypad modifier before testing for equality in that function or add the keypad modifier to the platform shortcut definitions in QKeySequence.