[Bug 34919] New: Quake Live standalone can't grab input correctly

http://bugs.winehq.org/show_bug.cgi?id=34919

Bug #: 34919
           Summary: Quake Live standalone can't grab input correctly
           Product: Wine
           Version: 1.7.6
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

Quake Live is moving out of the browser and becoming a standalone Windows
executable, dropping support for Linux and Mac OS X.

When testing the product preview in Wine, I have big issues related to the Alt
key.

1. After pressing "Join Game", the game grabs input like I want it.

Both Google and #winehq@freenode immediately suggest that window manager can
grab alt-mouse click, hence I feel it's necessary to confirm:

I can press Alt and click mouse and all works as intended (aka I can shoot and
turn around while shooting, even with the Alt key pressed). There is no problem
with mouse grab or window manager at this point.

2. After pressing a combination of Alt+Space, a Wine window menu appears, even
though Wine is WM-managed and even though the same combo has no "system" effect
on Windows (the key combo can be bound by game on Windows).

The game is completely stopped until I click mouse. Pressing Alt or Esc to
close the menu doesn't "unpause" game process.

3. After pressing Alt+any letter, mouse buttons (including mouse wheel
scrolling) stop working.

Keyboard works and moving mouse around still works, but mouse buttons are dead.
To get back from this state, I need to open and close menu (Esc-Esc) or console
(tilde-tilde).

If I'm in window mode, there's a very short time window (like 50 ms?) when the
mouse is un-grabbed and clicking the mouse in combination with alt+letter
actually is captured by the WM (to start moving window). But that's only a
side-effect of mouse un-grabbing. Again: to break mouse input, all I need is to
press alt+any letter, which for sure isn't captured by anything else but Wine
itself.

4. When I've tried Wine with non-WM-managed windows, there were more negative
effects, including complete game hang on pressing Alt alone (and resuming with
another Alt hit). So I went back to managed window.

5. I have thought about working around this by doing xmodmap -e "keycode 64 =
something else" but this has other unintended consequences and is system-wide.

I have tested it in Wine 1.6, 1.7.5 and 1.7.6 (I've built it with Fedora's
spec, including PulseAudio patch which works nicely and surely isn't related to
this problem).

TL;DR: Alt+any letter forcibly breaks game's input grab which can only be
regained by making the game release and re-grab input.

As an interim solution, is there a way to make Wine completely deaf to Alt
combos?