[PATCH 5/7] winex11.drv: only fetch DND data when requested by the receiving application

[Damjan Jovanovic]

We currently fetch all the DND data when the first XdndPosition message
arrives, and cache it for the duration of the drop. The spec does allows
this, but:
* it's not what Windows does.
* even on X11, the drag source can change the data during the drag, causing
  the drop target to receive outdated data.
* clipboard formats can have side effects (ICCCM 2.6.3): "DELETE" can cause
  data loss if requested during a move operation before the drop has
  occured. Blindly requesting every data type could be dangerous.

Signed-off-by: Damjan Jovanovic <damjan.jov at gmail.com>
---
 dlls/winex11.drv/clipboard.c |  12 ++
 dlls/winex11.drv/x11drv.h    |   1 +
 dlls/winex11.drv/xdnd.c      | 279 +++++++++++++++----------------------------
 3 files changed, 107 insertions(+), 185 deletions(-)
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