This requires adding a couple of window system interface events, namely
Map, Unmap, and Expose. When a widget is minimized on X11 it is
unmapped, and thus update requests should not be delivered. Instead the
event will delivered when the widget is mapped, which causes an Expose
event to be sent. The Unmap and Expose event thus need to be handled in
QWidgetWindow, and Map is also added for the purpose of API symmetry
(and for future needs).
Add and remove windows to the list of top level windows.
Correctly set the visibility flag for windows and implement
a QGuiApplication::topLevelAt() method that uses the
QPlatformScreen.
Create a guikernel/ directory that contains the files that'll go
into libQtGui. What remains in kernel/ will go into QtWidgets.
In addition to that image/, painting/ and text will end up
int QtGui.
Laszlo Agocs
Lars Knoll
Samuel Rødal
Olli Werwolff
Friedemann Kleint