Comment 4 for bug 1793395

I cannot find Ctrl+F in the accels.scm and those custom actions have a unique ID which is not known beforehand.

https://git.launchpad.net/xubuntu-default-settings/tree/etc/xdg/xdg-xubuntu/Thunar/uca.xml.in

Therefore, I assume that changes in the Thunar source code are needed.