Tab focus handling

[schnepe2]

The Tab (-keyboard) handling does not work as expected.
Most prominent "issue" when used with e.g. Confirm Dialog/Window.
To reproduce, just go to the Demo Site and
"tab" to the Confirm button,
open the Dialog (via <Space> or <Enter>)
..and try to select either "Yes" or "No" button via <Tab>

I've had a similar issue once ago and I think I had to "steal" the focus on opening of the dialog/window and then "restore" the previous one on closing. This might be a bit more complicated for the "chained" dialogs/windows...

[cboulanger]

The focus is "stolen" and "returned" as you suggest, but the problem is that the widget is not the "root" of focus and tabs (see qx API). I have asked on the qooxdoo gitter chat for some guidance on how to solve this issue.