[Ayatana-dev] XDND Problems

[Andrea Azzarone <azzaronea@xxxxxxxxx>]

Hi all,

I need your help. Some time ago I added to Unity code the
DNDCollectionWindow class.
DNDCollectionWindow is a X Window whose only goal is to collect drag and
drop data,
as soon as possible and not when the mouse pointer enters the launcher X
window (DBO idea).

You know, in X Window System there are too many times where other
clients don’t know
whats going on!!

Well it works well most of the time but there are two evil (at least
evil for me!)
problems.

1) We start to create the DNDColletionWindow about 200ms after the
starting of
the dnd. If the mouse move (without the releasing) is shorter than 200ms
the DNDCollectionWindow
will be create but no XdndEnter (or XdndPosition) event is received.
Well we could use
XWarpPointer to trigger a fake mouse movement (when we are sure that the
dnd collection window
is really onscreen). It works well.

2) What happens if the mouse button is released while the
DNDCollectionWindow is
still onscreen (i think that nux uses XMoveResizeWindow)? Well the
DNDCollectionWindow
receive the XdndDrop event. Maybe forwarding xdnd events could be a
soultion but
its fu**ing diffcult to do and prones to errors.

I have a patch but it doesn't works every single time (90?). So we can:

A) Fix problem 1 and discard problem 2
B) Discard problem 1 (the problem 2 is no longer present so...)
C) Revert the DNDCollectionWindow. In fact it improves the desing but it
could
damage the usability.
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