Created attachment 7063 [Patch] Remove button argument from xfce_panel_plugin_get_icon_size () Building thunar from git with commit https://git.xfce.org/xfce/thunar/commit/?id=ffcbbc86b42a508133a3209d472812cc69c22a7a is no longer possible after xfce4-panel commit https://git.xfce.org/xfce/xfce4-panel/commit/?id=c200ae82fcbee3572606280f3f69fa5840c7bfb5 (where the button argument is removed). The thunar-tpa code needs to be adjusted to account for this change. Attached is a patch.
Fixed with commit: https://git.xfce.org/xfce/thunar/commit/?id=43058c2ce5c9552665a7e76bc3090d8edd695414.