Created attachment 41425 [details] Screenshot <rdar://problem/7314421> The GarageBand Lesson Store has aqua scroll bars in addition to the internal black vertical scroll bar. Steps to Reproduce: 1. Open GarageBand 2. If the Lesson Store is selected in the GarageBand window’s sidebar, select a different item, quit GarageBand, and repeat from step 1. 3. In the GarageBand window, select Lesson Store on the left. Results: The Lesson Store has both aqua scroll bars and an internal black vertical scroll bar. See screenshot. Regression: This was caused by <http://trac.webkit.org/changeset/48064>, the fix for bug 28614 (which interestingly didn’t include a regression test).
r48064 (bug 28614) was an aggressive version of a fix. Bug 29167 modifies it to be more conservative. I wonder if that patch would help this bug too.
Created attachment 42576 [details] Made FrameView track whether it’s allowed to have scrollbars again
Bug 29167 attachment 42627 [details] should fix this.
*** This bug has been marked as a duplicate of bug 29167 ***