Steps to reproduce: 1. Start timeline recording, collect some JS execution. 2. Click the JavaScript & Events timeline 3. Select a record on the left sidebar 4. Click the JavaScript & Events timeline again The [x] on the left sidebar record should disappear when the relevant resource view is no longer visible. It seems now that it is only dismissed when another element is selected or the [x] is clicked.
<rdar://problem/20005723>
Created attachment 247672 [details] phantom [x] button
*** This bug has been marked as a duplicate of bug 139727 ***