Hi,

I am migrating an application from Qooxdoo 3.5.1 to 5.0 and, after fixing
some behaviour changes related to events (click to tap and so), I'm stuck
with a problem dragging onto an iframe.

The problem is that when dragging elements onto the iframe, the drag event
seems to get stalled at the limit of the iframe. You cannot enter the
iframe keeping the drag active (it's curious because if you capture the
event in the parent as I do in my app and you enter the iframe passing over
a zone not occupied by the iframe, then it seems it seems it captures the
event, but in any case the "dragover" event doesn't work).

In the examples I put below, you'll see that if you enter the iframe from
the top of the window, it doesn't work as I would expect (as it did in
3.5.1), but the drop event is caught. If, instead, you enter the iframe
from the bottom (and dragging fast), it doesn't.

You can see how behaviours differ from Qx 3.5.1 to Qx 5.0 in following
links to the playground.

3.5.1:
http://tinyurl.com/og6l97e

5.0:
http://tinyurl.com/nw3ur95

Does anybody know if Is this a bug or a behaviour change? If it is the
behaviour change, how would you achieve the goal of dropping onto the
iframe?

Thanks
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