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  1. Qt
  2. QTBUG-76509

Blank windows when reuse instance of QDialog::exec()

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    Details

    • Platform/s:
      Linux/X11, macOS, Windows

      Description

      Starting from Qt 5.12.4 to reuse instance of QDialog creates blank window, content is shown to user only after manualy resizing window by user ( imposibble with fixed size dialog )

       

      Bug in Windows 10 is first introduced in 5.12.4, Previous versions (<5.12.4) work as intended.

      Code to replicate bad behaviour:

       

      // Prepare test QDialog
      auto dialog = new QDialog( this );
      auto layout = new QVBoxLayout();
      layout->addWidget(new QLabel("This text should be visible") );
      dialog->setLayout( layout );
      
      // First use of dialog
      dialog->exec();
      // Correct content is shown
      
      // Second use of dialog
      dialog->exec();
      // Empty window is shown - it is visible again on size change by user.
      
      

      First use of dialog->exec() produces:

       

       

       

      Second use of dialog->exec() produces:

        Attachments

        1. bugv2.zip
          3 kB
        2. QDialog-first-use.png
          QDialog-first-use.png
          29 kB
        3. QDialog-secondt-use.png
          QDialog-secondt-use.png
          29 kB
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            People

            • Assignee:
              qt.team.quick.subscriptions Qt Quick and Widgets Team
              Reporter:
              michal.bernat Michał Bernat
            • Votes:
              7 Vote for this issue
              Watchers:
              19 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:

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