Some widgets such as QTableView do not call QIconEngine::pixmap(), but do
the drawing immediately through QIconEngine::paint(). This breaks alpha
blending for recolouring, since the underlying image canvas is not
necessarily transparent and also not anchored at (0, 0). This results in
a black box of the size of the icon bounding box.
Icon recolouring is now always done on a temporary QImage with
transparent background and only the finished end result is composed onto
the original canvas.
Fixes#6006
- Allow switching between themes without restart (except classic)
- Rework icon loading and recolouring logic to react to theme changes
- Automatically react to light/dark theme change
- Remove explicit selection of monochrome tray icon variant (selected
automatically now)
- Update theme background colours for Big Sur
- Update application icon to match Big Sur HIG
The tray icon doesn't respond perfectly to theme changes yet on Big Sur,
since we need different icons for dark and light theme and cannot simply
let the OS recolour the icon for us (we do that, too, but only as an
additional fallback). At the moment, there is no signal to listen to
that would allow this.
This patch adds a few generic methods to OSUtils for detecting and
communicating theme changes, which are only stubs for Windows and Linux at
the moment and need to be implemented in future commits.
Fixes#4933Fixes#5349
