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  1. Qt
  2. QTBUG-67434

setBackgroundColor on QWebEnginePage dosen't seem to work consistently

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P3: Somewhat important
    • Resolution: Done
    • Affects Version/s: 5.7.1, 5.10.1, 5.11.1, 5.12.2
    • Fix Version/s: None
    • Component/s: WebEngine
    • Labels:
      None
    • Environment:
      * qt 5.10.1 webinstaller
       * qt 5.7.1 - debian
       * qt 5.7.1 - from pypi via PyQt

      I think this affects every Qt version, at least starting from 5.7.1

      Description

      setBackgroundColor seems to be broken for me when viewing multiple 'types of link'.

      To reproduce on simplebrowser:

      1. Apply attached patches to simplebrowser (to set background color to black), and print a little debug information.
      2. Open a new blank tab with right click in tabbar -> new tab
      3. Navigate to file:///dev/null , which displays a completely black page.
      4. In the same tab, type 'qt.io' into the search bar, and hit enter.
      5. Navigate to file:///dev/null in the same tab.

      I expect this to display a black page, but instead, I see a white page.

      Furthermore, once this state is reached, I see white flashes between loads of webpages (which this setting is supposed to prevent). 

      Trying to workaround this issue by running setBackgroundColor repeatedly dosen't help, I must run it twice (to unset it, and set it back). Once doing that, it seems to work as expected, until it breaks again.

      Please let me know if I can provide any additional information.

       

        Attachments

        1. tabwidget.cpp.patch
          0.6 kB
        2. webpage.cpp.patch
          0.7 kB

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              Assignee:
              qt_webengine_team Qt WebEngine Team
              Reporter:
              jgkamat Jay Kamat
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                Dates

                Created:
                Updated:
                Resolved:

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