Visual glitches when changing application style from qlementine to a non-qlementine style

[IoeCmcomc]

Visual glitches appear in the sandbox example when the application style changes from QlementineStyleto a non-qlementine style (e.g. fusionor windowsvista) after the main window (SandboxWindow) is created.

How to reproduce:

1. In main.cpp file, comment out window->setCustomStyle(style);
2. In main.cpp file, put the following code after main window creation:

   qApplication.setStyle("windowsvista"); // or qApplication.setStyle("fusion");
   qApplication.setPalette(qApplication.style()->standardPalette()); // Force new style palette

3. Replace commented lines in the SandboxWindow constructor with the following code in SanboxWindow.cpp:

   _impl->setupUI_button();
   _impl->setupUI_buttonVariants();
   _impl->setupUI_checkbox();
   _impl->setupUI_radioButton();
   _impl->setupUI_commandLinkButton();
   _impl->setupUI_sliderAndProgressBar();
   _impl->setupUI_spinBox();
   _impl->setupUI_comboBox();
   _impl->setupUI_toolButton();
   _impl->setupUI_groupBox();

4. Compile and run the sandbox
5. Observe the issue

With fusion style

• Current behavior:
• Expected behavior:

With windowsvista style

• Current behavior:
• Expected behavior:

Note: Visual glitches don't occur when switching between fusion, Windows and windowsvista styles.

Debug information:

OS: Windows 11 23H2 Toolkit: Qt 5.15.2 MSVC2019 32-bit Compile mode: Debug

[oclero]

Thank you. I haven't tried to switch between styles, so wasn't aware of this bug. I'll take a look when I have time