[Bug 53624] New: Mode_switch layer with xmodmap isn't recognized

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53624

            Bug ID: 53624
           Summary: Mode_switch layer with xmodmap isn't recognized
           Product: Wine
           Version: 7.8
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs(a)winehq.org
          Reporter: cairn(a)pm.me
      Distribution: ---

Created attachment 73023
  --> https://bugs.winehq.org/attachment.cgi?id=73023
xmodmap example

With xmodmap, I am binding "Mode_switch" to CapsLock in order to simulate a
different layer of keys. I've attached a file (xmodmap.txt) which is all you
need to reproduce this. Download the file and run `xmodmap xmodmap.txt` to
enable the example key map.

The easiest way I've found to test this is to use `wine notepad`. In the
example keymap, Caps + H is bound to the left arrow key. Type something, then
press Caps + H. The expected behavior is to move the cursor to the left, but
this doesn't work. This issue happens with seemingly any application run
through Wine.

You can confirm with `xev` that the xmodmap configuration does indeed work.
I've attempted to use both keycodes and keysyms in the xmodmap configuration;
both result in the same issue. The problem doesn't occur when directly
rebinding a key without using "Mode_switch", but that isn't really a
workaround, so it still seems worth it to report the issue.

Tested on Ubuntu 22.04 running Wine 6.0.3 and GNU Guix running Wine 7.8.

The version of xmodmap is 1.0.10.

I've reviewed bug #20610 and I think it's worth recognizing this as a separate
issue. Maybe the solutions are related.

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