deleting desktop file with shift-del opens confirmation popup in wrong workspace
# Issue Description
When I press shift-del to delete a file on the Desktop, and if a thunar window is open on another workspace, then the confirmation popup ("Are you sure...?") opens on the workspace containing the thunar window, not on the current workspace. This happens silently; the user feels like nothing happened after pressing shift-del. Switching to thunar's workspace reveals the popup.
If no thunar windows are open anywhere, then the confirmation popup opens in the center of the current workspace as expected.
# Steps to Reproduce Issue
1. Open a thunar window on workspace 1.
2. Move to workspace 2.
3. Shift delete a file on the desktop.
4. Confirmation displays silently on workspace 1.
# Expected Behavior
Confirmation should pop up on workspace 2.
# Additional Information
Able to reproduce on three computers in my house running Arch Linux + XFCE. One of them has almost no customizations from the default config.
Able to confirm with another user in this [forum topic](https://forum.xfce.org/viewtopic.php?id=18251).
# Environment & Versions
* OS distribution and version: Arch Linux last upgraded March 21, 2025.
* Overall Xfce version: 4.20
* xfdesktop version (git hash if not a release): 4.20.1
* Windowing system (X11/Wayland): X11
* Compositor and version (if Wayland):
* GTK Theme: Default-hdpi,
* Icon Theme: elementary
* UI Scale Factor: 1x (no scaling)
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