[Bug 60164] New: WebView2 mouse hit testing is vertically offset under X11 since Wine 11.13

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60164

            Bug ID: 60164
           Summary: WebView2 mouse hit testing is vertically offset under
                    X11 since Wine 11.13
           Product: Wine
           Version: 11.15
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
  Target Milestone: ---
      Distribution: ---

Created attachment 81796
  --> http://bugs.winehq.org/attachment.cgi?id=81796
webview2 reproducer

I can reproduce this regression with a minimal Win32 WebView2 application.
Mouse hit testing is vertically offset from the visible cursor position by
approximately 20 pixels.

Wine 11.12 is good. Wine 11.13 is bad.

Git bisect:

    b868cd31d6b5fb0a5e09e45658c4901bb6d1c09a
    win32u: Move client surface rect computation out of the drivers.

Reproduction:

1. Install the WebView2 Runtime in the Wine prefix.
2. Keep webview2_duckduckgo.exe and WebView2Loader.dll in the same directory.
3. Run wine webview2_duckduckgo.exe.
4. Move the cursor over and click elements on the DuckDuckGo page. The element
receiving the mouse input is vertically displaced from the visible cursor.

The source code and compiled x86-64 reproducer are attached.

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