Created attachment 247671 [details] Screenshot at Step 5 Steps to reproduce: 1. Start timelines, capture some JS data. 2. Click on the main resource record. (shows cluster content view for main frame, subview DOM Tree) 3. Click on the network timeline on the left sidebar. (shows NetworkTimelineView) 4. Click the "back" arrow in the navigation bar (WRONG: shows cluster content view, but NetworkTimelineView is selected in sidebar) 5. Click the "back" arrow again (WRONG: shows main resource record selected in sidebar, but shows OverviewTimelineView with Resource detail sidebar. Earlier history is truncated!) It seems that the relevant resource view is shown and scrolled appropriately, but the record is not re-selected in the same state restoration action (as if two history states were created).
<rdar://problem/20005826>
Should be fixed by the tab based user interface as of: http://trac.webkit.org/changeset/183342