[Bug 58953] New: Wine 10 steals all mouse input when playing any game

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58953

Bug ID: 58953
           Summary: Wine 10 steals all mouse input when playing any game
           Product: Wine
           Version: 10.18
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: xinput
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ArchLinux

Issue: When launching any game with Wine 10 selected, the game steals all mouse
cursor focus completely, and does not relinquish control if the user switches
to a background app (i.e. Google Chrome and/or Discord). Makes any sort of
multitasking in completely impossible until the game in question is closed.

In certain games, like Grand Theft Auto V Enhanced, the inverse is true; while
mouse can be used in external apps, doing so completely shuts down ALL in-game
input, whether by gamepad or mouse and keyboard, requiring a force-close and
restart to restore normal functionality.

Expected Behavior, circa Wine 9 and earlier: Game relinquishes mouse cursor
control when switching between currently-running apps, allowing for normal
mouse control.

I already reported this same bug on Valve's Proton GitHub, but I figured I'd
tackle this severe issue at the source too.