EventHandler::eventMayStartDrag() is missing a conversion from window to contents coordinates, causing it to give false results. The only effect of that is that if you have a piece of selected text in a Safari window that's in the background, sometimes you cannot click-hold-and-drag the text out of the window. Instead, the window comes to the front right when you click it.
Created attachment 16119 [details]
Add missing coordinate conversion
Includes change log and manual test
Landed in r25248.