[Bug 51496] On KDE riched20:editor triggers a clipboard infinite loop, crashing explorer.exe

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51496

François Gouget <fgouget at codeweavers.com> changed:

           What    |Removed                     |Added
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           Keywords|                            |patch
           Assignee|wine-bugs at winehq.org        |fgouget at codeweavers.com

--- Comment #2 from François Gouget <fgouget at codeweavers.com> ---
Thanks a lot for the patch, it pinpointed the source of the issue.

Looking into it I figured out that the patch can be simplified:
* Only the Wine server can set the from field.
* The from field also can only reference entries that precede it in the list
because the synthesized formats must have a lower priority. That means when we
loop other the list the formats referenced by the from field will be removed
first.
* All the synthesized formats are below CF_MAX.

All that combined means we can check whether the format referenced by the from
field is 'present' by checking the format_map field which simplifies the code.
So I submitted a patch based on that idea. 

https://www.winehq.org/pipermail/wine-devel/2021-August/192280.html

I also wanted a test that can reproduce the issue to be sure I understood it
correctly. I also submitted a user32:clipboard patch for that:

https://www.winehq.org/pipermail/wine-devel/2021-August/192279.html

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