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  1. Qt
  2. QTBUG-50487

[REG 5.5->5.6]: Painting errors when enforcing a winId() on a child of QMdiArea/QToolBox when HighDPI/DPr scaling is active

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Details

    • Bug
    • Resolution: Done
    • P1: Critical
    • 5.6.0 RC
    • 5.6.0 Beta
    • Widgets: Widgets and Dialogs
    • None
    • Windows,Linux
    • b6630a5181cfc3935b13052e0a32d4008d89cdb6 (qtbase/5.6.0, 5.2.2016)

    Description

      The attached example enforces a winId() on a QPlainTextEdit within a QMdiArea and activates scaling via env vars for 5.5/5.6.

      The screen shots show that sth is messed up; probably related to the backing store (can't put my finger on it)?

      Note: Screen shots were taken on low res screens , this is why the font sizes are different between 5.5/5.6 - this is not relevant to this report.

      This also has been observed for QToolBox.

      Discovered while working on https://codereview.qt-project.org/#/c/146248/

      Attachments

        1. qtbug50487_creator.jpg
          555 kB
          Friedemann Kleint
        2. qtbug50487_win.jpg
          89 kB
          Friedemann Kleint
        3. qtbug50487_xcb.jpg
          78 kB
          Friedemann Kleint
        4. qtbug50487.zip
          2 kB
          Friedemann Kleint

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-50463 QT_SCALE_FACTOR=2 causes garbage

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

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-50713 QtQuickWidget causes QWidget based to be painted wit hwrong scale

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
          resulted from

          Task - A task that needs to be done. QTBUG-46615 Implement High DPI scaling v2 (5.6)

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
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            People

              sorvig Morten Sørvig
              kleint Friedemann Kleint
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              Dates

                Created:
                Updated:
                Resolved:

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