Make QWindow's windowState a QFlags of the WindowState

This reflects QWidget API, and restores some behavior from Qt4.
Some WM can have several state at the same time. On Plasma for example,
when a window is both maximized and minimized, the "maximized" checkbox
is checked from the taskbar entry.

The API of QPlatformWindow was changed to take a QFlag and the platform
plugins were adapted.

 - On XCB: Always send the full state to the WM. And read the full state.

 - On Windows: The code was originally written with '&' in Qt4, and was changed
   to == when porting. Some adaptation had to be made so the states would be
   preserved.

 - On macOS: Only a single state can be set and is reported back for now,
   with the possibly to expand this in the future.

 - Other platforms: Just do as before with the effective state.

Task-number: QTBUG-57882
Task-number: QTBUG-52616
Task-number: QTBUG-52555
Change-Id: I7a1f7cac64236bbd4c591f796374315639233dad
Reviewed-by: Gunnar Sletta <gunnar@crimson.no>
Reviewed-by: Robin Burchell <robin.burchell@crimson.no>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/plugins/platforms/android/qandroidplatformwindow.cpp b/src/plugins/platforms/android/qandroidplatformwindow.cpp
index 97a1f30a35..74dc955814 100644
--- a/src/plugins/platforms/android/qandroidplatformwindow.cpp
+++ b/src/plugins/platforms/android/qandroidplatformwindow.cpp
@@ -56,7 +56,7 @@ QAndroidPlatformWindow::QAndroidPlatformWindow(QWindow *window)
     m_windowState = Qt::WindowNoState;
     static QAtomicInt winIdGenerator(1);
     m_windowId = winIdGenerator.fetchAndAddRelaxed(1);
-    setWindowState(window->windowState());
+    setWindowState(window->windowStates());
 }
 
 void QAndroidPlatformWindow::lower()
@@ -103,7 +103,7 @@ void QAndroidPlatformWindow::setVisible(bool visible)
         QtAndroid::setApplicationActive();
 }
 
-void QAndroidPlatformWindow::setWindowState(Qt::WindowState state)
+void QAndroidPlatformWindow::setWindowState(Qt::WindowStates state)
 {
     if (m_windowState == state)
         return;