Can't reassign Cut command (Ctrl+X always cuts)

[AlansCodeLog]

Godot version:
3.0.2

OS/device including version:
Windows 10 64bit

Issue description:
I like to use Control+X for redo but I can't seem to override the shortcut for it. In the Script Editor > Edit menu, it shows up correctly and pressing it there works, but pressing Control+X still cuts the line and doesn't redo.

Even just removing the Control+X assignment doesn't work, it still cuts.

Tested on "blank" install (removed user prefs, let it remake it's own, then removed cut command) as well.

Steps to reproduce:
These are the preferences that were changed in the editor-settings-3.tres file on a clean install after removing the cut command assignment from the editor.

shortcuts = [ "script_text_editor/capitalize", SubResource( 1 ), "script_text_editor/convert_to_lowercase", SubResource( 2 ), "script_text_editor/convert_to_uppercase", SubResource( 3 ), "script_text_editor/cut", null, "script_text_editor/redo", SubResource( 4 ) ]

[Calinou]

Closing in favor of #29490 as it essentially tracks the same issue.