[Bug 50394] New: World of Warcraft: Hardware Cursor Quirks under XWayland

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50394

            Bug ID: 50394
           Summary: World of Warcraft: Hardware Cursor Quirks under
                    XWayland
           Product: Wine
           Version: 5.21
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: jaapbuurman at gmail.com
      Distribution: ---

World of Warcraft's hardware cursor mouse is not working correctly compared to
X11 or Windows under XWayland. By default, a software cursor is used (with its
own issues that happen under Windows as well), but one can change to a hardware
cursor by issuing the following command in the chat window: /console
rawMouseEnable 1

Once the hardware cursor is enabled, to reproduce the bug do the following:

1) Press and hold the left mouse button, this will hide the cursor and will now
allow you to rotate the camera by moving the mouse.
2) Move the mouse all the way to the left to rotate the camera to the left.
This will work fine until the hidden cursor reaches the end of the monitor to
the left. Under X11 and Windows, you can keep rotating left for as long as you
want.
Optional 3) If you have multiple monitors, move the cursor all the way to the
right to rotate the camera right. Your mouse will end up on the right monitor.

A workaround is to enable wine's "Automatically capture the mouse in
full-screen windows" option, but that obviously breaks your ability to
seamlessly multitask between WoW on one monitor, and a browser on another for
example. Under X11 that option is not required, and the mouse behaves well when
pressed down without that workaround, allowing you to easily multitask when not
holding the mouse button down.

At first I reported said issue upstream at XWayland's tracker, where they could
also reproduce the issue. Unfortunately, it seems it's WoW doing something
stupid, which they cannot work around without breaking other applications and
they also cannot implement application specific workarounds. Therefor, I am now
reporting said issue here.

I quote:

"I added SET rawMouseEnable "1" in Config.wtf and can indeed reproduce then.
Checked what the game does and it's kinda terrible for us...On Windows and X11
the pointer does in fact leave the window, the cursor is just hidden meanwhile.
On button release, the application tries to warp the pointer back into the
application window, back to the button press coordinates.

This throws off the pointer warping heuristics in Xwayland. The cursor being
hidden would usually trigger the pointer lock if there was a confinement in
addition, but there's none. And anyway pointer locks are only meant to work
under the surface coordinates, they cannot be used to belatedly bring the
pointer back to the surface. Wine's "Automatically capture mouse" option
enforces a pointer confinement, so brings things back to working.

Maybe @ofourdan can think of something here, I certainly can't. The
wayland-friendly solution is to preemptively lock the pointer, but changing
that heuristic is likely going to break other apps. Being something that
requires tinkering (at least on WoW), I'm hesitant to change much tbh..."

Reference: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1115

The game has a free trial, so reproducing it should be relatively easy. If you
need any additional information, please do not hesitate to ask!

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