Instead of assuming the previous rendering context is still valid, the patched version destroys and recreates the viewerframe's surface on every mode change. This is a brute-force but effective method to prevent stale data.
Safe state patching
The unfixed version of this issue—before the patch—manifests in several irritating ways. Users and developers reported symptoms such as:
Only video playback software needs this patch. Fact: Any software with live-updating graphical panels—from stock tickers to radar systems—benefits from a proper mode refresh.
# Usage refresh_interval = 60 # 1 minute viewer_frame_refresh = ViewerFrameRefresh(refresh_interval) viewer_frame_refresh.start_refresh() viewer_frame_refresh.patch_viewer_frame_mode()
Security patches for viewerframe vulnerabilities usually roll out when developers realize the refresh command is being used as a .