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  1. Qt
  2. QTBUG-106033

Setting Qt::WindowStaysOnTopHint/Qt::WindowStaysOnBottomHint breaks winId

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    • Linux/X11

    Description

      I attached an example program which works correctly under Qt 5 and fails under Qt 6. On Qt 5, two windows, one entirely native X11, and one rendering inside a QWindow, display a red and a blue moving square. On Qt 6 the QWindow one does not display anything.

      When

      win.setFlags(win.flags() | Qt::WindowStaysOnTopHint);

      is called, it seems that in Qt 6 the winId is invalidated - in this example it's not really problematic but it is much more when one has to pass the winId to an external API which does not support reloading it after the fact. For instance in my case the software allows to set whether the windows always stay on top as a user preference which can be changed mid-flight.

      Attachments

        1. qtbug106033.zip
          2 kB
        2. QTBUG-106033.tar.gz
          1 kB
        3. main.cpp
          2 kB

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-118049 [Reg 5.15.8->5.15.10?/6.x][XCB plugin] QWidget::winId() can return invalid xcb_drawable_t values

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-105395 WM_TRANSIENT_FOR is not kept in sync

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          resulted from

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-73485 Issue with Qt::WindowStaysOnTopHint

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-69515 Linux, WindowStaysOnTopHint does not work.

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-81341 Window won't receive events above Gnome Dock despite X11ByPassWindowManager + WindowsStaysOnTop is set

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              liaqi Liang Qi
              jcelerier Jean-Michaël Celerier
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              Dates

                Created:
                Updated:

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