* fix: handle fullscreen windows on special workspaces
inFullscreenMode() only checked m_activeWorkspace, missing fullscreen
windows on special workspaces. This caused crashes and incorrect
behavior when fullscreen windows were on special workspaces.
Changes:
- inFullscreenMode() now checks special workspace first since it
renders on top of regular workspaces
- Added getFullscreenWindow() helper to safely get fullscreen window
from either active or special workspace
- Updated callers (shouldSkipScheduleFrameOnMouseEvent, Renderer,
getFSImageDescription) to use the new helper
- Reset m_aboveFullscreen for layer surfaces when opening, closing,
or stealing special workspaces between monitors
* test: add special workspace fullscreen detection tests
Add tests for the new special workspace fullscreen handling introduced
in the previous commit. The tests cover:
1. Fullscreen detection on special workspace - verifies that a window
made fullscreen on a special workspace is correctly detected
2. Special workspace fullscreen precedence - verifies that when both
regular and special workspaces have fullscreen windows, the special
workspace window can be focused when the special workspace is opened
3. Toggle special workspace behavior - verifies that toggling the
special workspace off properly hides it and returns focus to the
regular workspace's fullscreen window
These tests exercise the key code paths modified in the fix:
- inFullscreenMode() checking special workspace first
- getFullscreenWindow() helper returning correct window
- Layer surface m_aboveFullscreen reset on special workspace toggle
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