Guard against cursor theme changing in animation timer
PreviewWidget has a timer that advances to the next frame of the current cursor. "current" can change in setTheme, we need to stop the animation timer BUG: 456526
PreviewWidget has a timer that advances to the next frame of the current cursor. "current" can change in setTheme, we need to stop the animation timer BUG: 456526
mentioned in commit f844007b
·mentioned in commit f844007b