[Bug 56821] New: Keyboard modifiers behavior is unreliable

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56821

Bug ID: 56821
           Summary: Keyboard modifiers behavior is unreliable
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Sometimes, modifiers are unreliable in combination with letters.

The issue stems from Wine commit made 15 years ago: 
https://gitlab.winehq.org/wine/wine/-/commit/a4a5a2ec121eeb2a7cd4ffbb5ba7b29...
Wine attempts to sync with the Linux SCIM keyboard state, leading to scenarios
where processing modifiers KeyUp events cause the state of ignoring them.
Attached example shows extra WM_KEYUP message of “Shift” in combination with
“e”.

Wine result:
KeyDown: 16
KeyUp: 16
KeyDown: 69
KeyUp: 69
KeyUp: 16

Expected result:
KeyDown: 16
KeyDown: 69
KeyUp: 69
KeyUp: 16