Details
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Bug
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Resolution: Unresolved
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P2: Important
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None
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6.8.1
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None
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Windows 11
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Windows
Description
When a window is in fullscreen mode and setGeometry is called, it loses the ability to restore the title bar.
I've only tested on Windows.
From the debugging I've done, it seems like the issue is caused by setGeometry changing the window state, but not calling SetWindowPos to refresh the style. Then, when calling showNormal after setGeometry, the state (and therefore the style) is not updated because the widget thinks it's still in the same state and early returns.
Noteworthy functions:
QWidgetPrivate::setGeometry_sys QWindowsBaseWindow::setGeometry_sys QWindowsWindow::setWindowState_sys
Code to reproduce:
QApplication application(argc, argv); QMainWindow window; window.showFullScreen(); // Commenting the following line prevents the bug from happening // Can also be move or resize, they have the same behavior window.setGeometry(100, 50, 500, 500); window.showNormal(); application.exec();
The issue can be worked around by using the following code instead of showNormal:
HWND hwnd = reinterpret_cast<HWND>(window.winId()); LONG_PTR style = GetWindowLongPtr(hwnd, GWL_STYLE); style = WS_POPUP | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_SIZEBOX | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX; SetWindowLongPtr(hwnd, GWL_STYLE, style); SetWindowPos(hwnd, nullptr, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED); window.show();