Need to listen for touchstart in addition to mousedown, or otherwise clicking a blank area of the screen won't close popups on iOS.  Fixes regression from [30957], refs #13341 !strict.   Behavior still not perfect: clicking a blank area of the screen closes the popup but then focuses the associated input (at least on test_DateTextBox.html), unwantedly bringing up the keyboard.
Need to listen for touchstart in addition to mousedown, or otherwise clicking a blank area of the screen won't close popups on iOS.  Fixes regression from [30957], refs #13341 !strict.   Behavior still not perfect: clicking a blank area of the screen closes the popup but then focuses the associated input (at least on test_DateTextBox.html), unwantedly bringing up the keyboard.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@31012 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful