Popups or dialogs not recognized by Sway WM as floating windows

Version information

• Thunar 4.18.11
• Void Linux (amd64, glibc)
• Sway 1.9 (Wayland Tiling Window Manager) and the Xfce desktop 4.18 are installed.

Steps to reproduce

1. Open Thunar (tiling or floating, doesn't matter) in a Sway session
2. Attempt to copy/paste a file that already exists on the target directory, causing a conflict resolution dialog to open

Current behavior

Thunar is started as a Wayland application. It appears to be missing attributes that would allow Sway to recognize these dialogs as floating windows.

Expected outcome

I made the following question on the #sway IRC channel:

For a Wayland app, is there an attribute that identifies popup/dialog windows? Something we could match with CRITERIA. For example, Thunar 'File Operation Progress' dialog is tiled when it should be floating. I wonder if there's anything Xfce developers can do to fix it on their side.

To which Sway maintainer kennylevinsen replied:

they should just set the parent

Or, set min/max dimensions equal to indicate a non-resizable window

Additional information

Workaround in Sway config:

for_window [app_id="thunar" title="^File Operation Progress$"] floating enable
for_window [app_id="thunar" title="^Confirm to replace files$"] floating enable