We used to make a minimal selection in Timeline overview as a side effect of window selection logic -- however, it wasn't centered on a cursor, which is irritating. Let's handle single click explicitly, creating a minimal overview centered around cursor.
Created attachment 134581 [details]
Committed r112531: <http://trac.webkit.org/changeset/112531>
Reverted at r112538: http://trac.webkit.org/changeset/112538 (regressed window selection)
Created attachment 136030 [details]
Committed r113443: <http://trac.webkit.org/changeset/113443>