For some reason I am unable to delete a script.
I am using 3.1.1 stable on Linux mint 19.2.
The steps I follow are...
-create a project.
-create a node and attach a script to that node.
-create the script using the subsequent script creation dialog.
-right click on node and clear script
-in godot editor file system panel, I right click on the script and hit 'delete'
It then shows a a dialog entitled "Load Error", and the body contains the string "Cannot Remove res://my_script.gd".