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

[Damjan Jovanovic]

Only fetches targets from the drag source when requested to by the
drop target. This is more correct as it avoids fetching dangerous
targets with side effects such as DELETE, prevents a potential
slowdown in DragEnter as all the data is fetched en-masse and
similarly reduces memory usage, and only accesses data that the
application needs. Also eliminates an unnecessary critical section.

Damjan Jovanovic
---
 dlls/winex11.drv/clipboard.c |  14 ++
 dlls/winex11.drv/x11drv.h    |   1 +
 dlls/winex11.drv/xdnd.c      | 350 +++++++++++++++++--------------------------
 3 files changed, 150 insertions(+), 215 deletions(-)
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