/usr/share/vim/vim91/ftplugin
Edit: /usr/share/vim/vim91/ftplugin/gdshader.vim (309B)
vim9script
# Vim filetype plugin file
# Language: Godot shading language
# Maintainer: Maxim Kim
# Website: https://github.com/habamax/vim-gdscript
if exists("b:did_ftplugin") | finish | endif
b:did_ftplugin = 1
b:undo_ftplugin = 'setlocal suffixesadd<'
setlocal suffixesadd=.gdshader