Hi, thank you for reporting the bug. This behaviour is indeed a regression and was introduced with https://codereview.qt-project.org/c/qt/qtbase/+/619145 to 6.10.2 and 6.11beta2 by me. Sorry for that. A bug report related to the issue seems already created with https://qt-project.atlassian.net/browse/QTBUG-143832. In case you have additions to the report you are welcome to comment on the bugtracker.
Best regards, Wladimir Leuschner ________________________________ Von: Interest <[email protected]> im Auftrag von coroberti <[email protected]> Gesendet: Dienstag, 3. Februar 2026 11:35 An: Qt Interest <[email protected]> Betreff: [Interest] Qt-6.10.2 Widgets - Qt::CustomizeWindowHint Is Broken on Windows Hi, Qt::CustomizeWindowHint was removing the three right-angle controls from a window for many years, but it seems to be now broken for Qt-6.10 at least on Windows. Qt::Window| Qt::WindowTitleHint | Qt::CustomizeWindowHint Thus, we were getting a window with a title-bar but without the 3 controls from the right side. Status for now is: [image.png] All controls are present and maximize is even active. The attempts to remove the controls by getting flags and zeroing the bit for flags like & ~ individual hint - all failed. The only workaround that works 4me is adding the flag Qt::MSWindowsFixedSizeDialogHint - the consequence is that the image icon gets out. You can compile versus the Qt-6.10.2 and easily reproduce the break by using the Windows Flags Example. https://doc.qt.io/archives/qt-5.15/qtwidgets-widgets-windowflags-example.html and the code: https://code.qt.io/cgit/qt/qtbase.git/tree/examples/widgets/widgets/windowflags?h=5.15 Am I the only one to see it or most people do not advance to the latest Qt? Thanks. Kind regards, Robert Iakobashvili ............................ Confidential
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