[Bug 59822] New: Mouse clicks not received in VST plugin UIs (child windows) since Wine 9.22 — virtual desktop workaround breaks dropdown positioning

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59822

            Bug ID: 59822
           Summary: Mouse clicks not received in VST plugin UIs (child
                    windows) since Wine 9.22 — virtual desktop workaround
                    breaks dropdown positioning
           Product: Wine
           Version: 11.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 81088
  --> http://bugs.winehq.org/attachment.cgi?id=81088
Dropdown appears in wrong window
> **System:**
> - OS: Fedora 44
> - Wine versions tested: Wine Staging 11.0 (system), Wine 9.21 built from source with GCC 16 (`--enable-win64`)
> - yabridge (latest) with `embed-editor = false`
> - DAW: Reaper
> - Audio: PipeWire/JACK
> - Display: X11 and Wayland (same behavior on both)
>
> **Problem:**
> VST plugin UIs render correctly and automation responds, but mouse clicks are not received. Enabling virtual desktop in winecfg restores clicks but dropdowns open inside the virtual desktop window instead of the plugin UI. No combination of `embed-editor = true/false` and virtual desktop on/off resolves both issues simultaneously.
>
> **Versions tested:**
> - Wine Staging 11.0 — clicks broken
> - Wine 9.21 built from source (GCC 16) — same behavior
>
> Wine 9.21 RPM packages are not available for Fedora 44 so a clean pre-built 9.21 Staging binary could not be tested.
>
> **Expected behaviour:** Mouse clicks should be received by plugin UIs hosted as child windows without virtual desktop emulation.

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