effects/blur: Properly handle empty blur regions set by internal windows
The task switcher has a valid empty blur region and the blur effect misdetects that, which results in no blurred background. BUG: 433131
parent
34bfc257
The task switcher has a valid empty blur region and the blur effect misdetects that, which results in no blurred background. BUG: 433131
mentioned in commit 75c58222
·mentioned in commit 75c58222