[Bug 59492] New: Wine 11.3: Application renders partial viewport (Splashtop RMM)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59492

            Bug ID: 59492
           Summary: Wine 11.3: Application renders partial viewport
                    (Splashtop RMM)
           Product: Wine
           Version: 11.3
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 80495
  --> http://bugs.winehq.org/attachment.cgi?id=80495
Image of what I see, remote desktop was 1080P rendered slightly below 1080P on
my desktop

When connecting to a remote desktop with a higher resolution than the local
window (e.g. 4K remote on 1080p local), Splashtop renders only the top-left
portion of the remote desktop that matches the local window resolution in
pixels (1:1), leaving the remainder black. Reducing zoom makes the rendered
area smaller rather than larger, suggesting the viewport is calculated as
window_size × zoom_factor rather than scaling remote content to fit the window.
The application works correctly on native Windows.

Steps to reproduce:
1. Configure Splashtop RMM client to launch from atera/similar agent
2. Launch Splashtop RMM client under Wine and connect to a remote desktop with
resolution higher than the local window
3. Observe that only the top-left portion renders; remainder is black

  Expected: Remote desktop content scales to fit the local window, renders full
desktop

I used this guide to get wine to launch splashtop from linux, but this did not
modify wine (i think?) and this is occurring on both stable and staging
versions of wine. 
https://community.syncromsp.com/t/splashtop-remote-access-from-linux-workaro...

Additional testing — winewayland driver:                  

Launching the application with DISPLAY= (unset) and WAYLAND_DISPLAY=wayland-0
to force Wine's native Wayland driver produced identical rendering behaviour,
ruling out XRandR/Xinerama coordinate reporting as the direct cause. The
partial viewport issue persists regardless of whether the X11 or Wayland
graphics driver is used, suggesting the root cause is in a higher-level API
(possibly GetSystemMetrics, GetMonitorInfo, or similar?) returning unexpected
values on a multi-monitor system where one monitor has negative virtual screen
coordinates.


I am unsure if there are any logs that can help - but if you'd like to point me
to what you need I'm happy to grab them and upload them.

Also I'm kind of an idiot so I used claude to help generate a bug report as I
don't want to waste anyone's time with a useless bug report that didn't have
information that may be needed. I went over everything and it is correct, but
any suggestions are claude conjecture so if they make no sense, I apologize.
It's just a very strange issue.

System info:
Arch Linux x86_64
Kernel: 6.18.13-arch1-1 
DE: Plasma 6.6.1/Wayland
Host: Vostro 15 7510

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