1. In the Sources panel, click the "Collapse right sidebar" button in the tab strip. 2. Drag the rightmost dragger handle in the tab strip to the left. An invisible right sidebar (white background) with a considerable minimum width appears.
Created attachment 161409 [details] Patch
Comment on attachment 161409 [details] Patch Clearing flags on attachment: 161409 Committed r127116: <http://trac.webkit.org/changeset/127116>
All reviewed patches have been landed. Closing bug.