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  1. Qt
  2. QTBUG-82701

Windows 7: Strange processing pause when QToolTip is first shown

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Details

    • Bug
    • Resolution: Done
    • P1: Critical
    • 5.15.0 Beta4
    • 5.14.1
    • Core: Event loop
    • None
    • Windows 7, MSVC 2017 and MinGw 7.3. Fast 8-core CPU (i7-7820X @3.6GHz), 64GB RAM, NVIDIA GTX970 GPU.
    • Windows
    • e0d80167c18b5a71acf4dac59f3e6f37292fa397 (qt/qtbase/5.14)

    Description

      At least some part of event processing seems to "pause" (or hang) when a tooltip is first shown.

      Please run attached example and hover over the first label. When the tooltip appears, the animation on the label below it should pause for a second or so.

      I used a QPropertyAnimation for the demo because that's when I first noticed the issue with my app. I first tried with a blinking cursor and then an animated GIF inside a QMovie (on a QLabel), but neither of those seem affected. So I'm not sure what exactly is affected by this issue (GUI events in general or something specific to animations).

      Qt 5.12.x doesn't do this (I haven't tried 5.13).

      Reproduced with MSVC 2017 and MinGW 7.3, in both Debug and Release modes.  

      No observed issues on Linux.

      Attachments

        1. qtbug82701.zip
          2 kB
        2. ttpause.cpp
          0.7 kB

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-83004 Tooltips and ComboBox dropdown animation stutter on Windows

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-83151 Animation freezes midway when triggered from the notification area (system tray) icon

          • 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-82536 Menus are slow to open

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-77464 [REG] Window movement stalls in animated Qt Quick applications on Windows

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-83211 Context menus not refreshed properly

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-83158 WM_QT_SENDPOSTEDEVENTS suppresses MFC's idle processing

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-85676 Issue with openUrlExternally

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          For Gerrit Dashboard: QTBUG-82701
          # Subject Branch Project Status CR V
          294403,5 QEventDispatcherWin32: fix posted events delivering 5.14 qt/qtbase Status: MERGED +2 0

          Activity

            People

              alex1973tr Alex Trotsenko
              mpaperno Maxim Paperno
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              Dates

                Created:
                Updated:
                Resolved:

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