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Type: User Story
Resolution: Unresolved
Priority: P2: Important
Fix Version/s: None
Affects Version/s: None
Component/s: GUI: Window management
Labels:
None

Platform/s:

macOS, Windows

Based on feedback in https://codereview.qt-project.org/c/qt/qtbase/+/412497 it's clear that we need to investigate how Qt behaves when the application is using full screen windows, and expect either fullscreen exclusive access (for performance), or not (for showing dialogs/popups on top of the fullscreen window).

This applies primarily to Windows OpenGL-accelerated windows (WS_BORDER) but also potentially to macOS (https://developer.apple.com/documentation/appkit/nswindowcollectionbehavior?language=objc)

Existing APIs

Qt 5

QWindowsWindowFunctions::setHasBorderInFullScreen(QWindow *window, bool border)
QWindowsWindowFunctions::setHasBorderInFullScreenDefault(bool border)

Qt 6

QNativeInterface::Private::QWindowsWindow::setHasBorderInFullScreen(bool border)
(no way of setting a default)

Relevant Changes

"Windows: fix fullscreen OpenGL window issues with an opt-in function" 69839e55c13000ee9bf8d8e9d74b70096a92ae51 https://codereview.qt-project.org/c/qt/qtbase/+/143831 (explanation)
"Windows: Add a default setting for hasBorderInFullScreen" 7264bf19dbc47b805bb7af5df584ce1aae081962| https://codereview.qt-project.org/c/qt/qtbase/+/246155

is duplicated by

QTBUG-53571 Widget can not show correctly if there's a fullscreen QOpenGLWidget

Closed

relates to

QTBUG-47247 Windows/Desktop GL: Flicker when creating another top level window on a full screen GL window

Reported

QTBUG-41883 Windows: main menu no more active when in fullscreen with qopenglwidget

Closed

QTBUG-41309 QOpenGLWidget and QOpenGLWindow problems under Fullscreen

Closed

QTBUG-42410 QtQuick fullscreen Window buggy alt-tab and screenshot behaviour

Closed

QTBUG-71855 Windows: Fullscreen Desktop GL application is in wrong orientation when a monitor is in portrait orientation

Closed

(1 relates to)

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For Gerrit Dashboard: QTBUG-104511
#	Subject	Branch	Project	Status	CR	V
412497,6	Make work-around for fullscreen widget w. openGL (Windows)	dev	qt/qtbase	Status: ABANDONED	0	0
418545,4	Add more details on how to set the WS_BORDER flag	dev	qt/qtdoc	Status: MERGED	+2	0
419263,2	Add more details on how to set the WS_BORDER flag	6.4	qt/qtdoc	Status: MERGED	+2	0
419264,2	Add more details on how to set the WS_BORDER flag	6.3	qt/qtdoc	Status: MERGED	+2	0
429574,6	Add QWindowsApplication::setHasBorderInFullScreenDefault() native interface	dev	qt/qtbase	Status: MERGED	+2	0
595889,4	Prevent exclusive fullscreen with a mask	dev	qt/qtbase	Status: ABANDONED	0	0