Dear Wladimir, Additionally, removing the patch you mentioned and *Qt::WindowSystemMenuHint* :
Qt::Window | Qt::CustomizeWindowHint | Qt::WindowTitleHint | Qt::WindowStaysOnTopHint | *Qt::WindowSystemMenuHint* together with this->setWindowIcon(QIcon(appIconPath)); indeed adds the icon from the left as well as inactive Close control from the right - this is an unwanted addition: [image: image.png] Thanks, Kind regards, Robert Iakobashvili ............................ On Mon, Feb 9, 2026 at 5:12 PM coroberti <[email protected]> wrote: > Wladimir, > Volker says the following: > "The system menu is one of those things; so without > Qt::WindowSystemMenuHint or any other button (which might imply a system > menu with the corresponding entry) > I’d expect no window menu. *And without window menu, there’s no space for > an icon*." > > You are breaking the behavior of Qt-4, next Qt-5, next Qt-6 till Qt-6.10 > and even worse, you are doing that in the mid of Qt-6. > > Could you please send these considerations to Volker, and at least > postpone it to the next major Qt-7? > Thanks. > > As a minor request, please kindly try not to top-post in your next > messages since it forces me to top-post as well. > Thank you in advance! > > Kind regards, > Robert Iakobashvili > ............................ > > > On Mon, Feb 9, 2026 at 4:54 PM Wladimir Leuschner < > [email protected]> wrote: > >> Hi, >> >> The patch that caused the regression is now reverted and in 6.10.3 the >> old behaviour should be there again. Regarding the Window Icon when using >> Qt::CustomizeWindowHint, there is an answer by Volker Hilsheimer in the >> comments of https://qt-project.atlassian.net/browse/QTBUG-143832. >> >> Best regards, >> >> Wladimir Leuschner >> >> Public >> ------------------------------ >> *Von:* coroberti <[email protected]> >> *Gesendet:* Freitag, 6. Februar 2026 08:00 >> *An:* Wladimir Leuschner <[email protected]>; Qt Interest < >> [email protected]> >> *Betreff:* Re: [Interest] Qt-6.10.2 Widgets - Qt::CustomizeWindowHint Is >> Broken on Windows >> >> Sie erhalten nicht häufig E-Mails von [email protected]. Erfahren Sie, >> warum dies wichtig ist <https://aka.ms/LearnAboutSenderIdentification> >> On Tue, Feb 3, 2026 at 8:45 PM coroberti <[email protected]> wrote: >> >> On Tue, Feb 3, 2026 at 7:02 PM Wladimir Leuschner < >> [email protected]> wrote: >> >> >> 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: 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? >> >> >> Hi, >> Even if it were reversed, there is still an issue with presentation of >> the left angle Windows icon on the window. >> Perhaps the issue is the general for Qt-6.10 series. >> >> When the flag Qt::CustomizeWindowHint is set, the small windows icon is >> not shown >> unless one adds ad least a single control like flags |= >> Qt::WindowCloseButtonHint >> >> It is just ignored: >> this->setWindowIcon(QIcon(appIconPath)); >> >> Thanks, >> Robert >> >
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