fix spurious _KeyNavContainer test failures on IE10 due to async focus(), refs #16926
fix spurious _KeyNavContainer test failures on IE10 due to async focus(), refs #16926

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@31084 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful