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  1. Qt
  2. QTBUG-67069

QDockWindow jumps back after user resize

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    Details

    • Type: Bug
    • Status: Reported
    • Priority: P3: Somewhat important
    • Resolution: Unresolved
    • Affects Version/s: 5.11.0
    • Fix Version/s: None
    • Labels:
      None
    • Environment:
      I tested this under Windows 10, with Qt 5.10.1 with MinGW32 compiler. However, it looks from the code that the issue is independent of environment.

      Description

      Expected behaviour:

      • When I resize a docked QDockWindow manually, and afterwards resize the QMainWindow, I expect the size of the QDockWindow to remain.

      Real behaviour:

      • I have resized the docked QDockWindow manually. When I afterwards resize the QMainWindow, the QDockWindow's size jumps back to its original size.
      • However, once I drag any QDockWindow out to be floating, this bug ceases to occur.

       

      It seems to me, that commit https://github.com/qt/qtbase/commit/60be2fb6a13315f074c3c0b7793c38632f291e8b introduced this bug, because the internal variable QDockAreaLayout::fallbackToSizeHint gets set to false only in the QMainWindowLayout::hover method (which gets called e.g. on moving a floating window), but not on startSeparatorMove (which gets called once the user resizes a docked QDockWindow manually).

       To fix this, I think the function QMainWindowLayoutSeparatorHelper<Layout>::startSeparatorMove (or endSeparatorMove) must be modified to set fallbackToSizeHint = false.

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              Unassigned Unassigned
              Reporter:
              max.weller Max Weller
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                Updated:

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