runtime(gdscript): add recommended indent options to ftplugin

related: #15264

Signed-off-by: markmacode <code@mamo.aleeas.com>
Signed-off-by: Maxim Kim <habamax@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/gdscript.vim b/runtime/ftplugin/gdscript.vim
index 93519d8..d1f41c8 100644
--- a/runtime/ftplugin/gdscript.vim
+++ b/runtime/ftplugin/gdscript.vim
@@ -4,6 +4,7 @@
 # Language: gdscript (Godot game engine scripting language)
 # Maintainer: Maxim Kim <habamax@gmail.com>
 # Website: https://github.com/habamax/vim-gdscript
+# Last Change: 2024 Jul 14
 
 if exists("b:did_ftplugin") | finish | endif
 
@@ -22,6 +23,11 @@
 setlocal foldignore=
 setlocal foldexpr=GDScriptFoldLevel()
 
+if get(g:, 'gdscript_recommended_style', 1)
+    setlocal noexpandtab tabstop=4 softtabstop=0 shiftwidth=0
+    b:undo_ftplugin ..= ' | setlocal expandtab< tabstop< softtabstop< shiftwidth<'
+endif
+
 
 def GDScriptFoldLevel(): string
     var line = getline(v:lnum)