[Bug 48946] Uplay crash when launching Watchdogs with esync patch applied

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48946

--- Comment #11 from Rémi Bernon <rbernon at codeweavers.com> ---
The code iterates the process list on every rawinput message to see which one
is interested. Then, every process can register for rawinput message and may
specify a target window, or let the system send the message to the foreground
window if it belongs to the given process.

The first implements that by getting the target thread for the device (either
the owner of the target window, or the foreground thread), then it compares
with the process that is currently checked, and if the thread is from another
process bails out - this other process will get its own iteration step and
receive the message if it is interested.

Then, the second if implements a different check where, if the target thread is
not from the foreground process (the process to which belongs the foreground
window), then we should only sent the messages if a specific flag is used,
which is first unimplemented -not supporting RIDEV_INPUTSINK flag /
WM_INPUTSINK messages, and then later implemented in a different patch series.

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