runtime(tutor): improve tutor.vim plugin and filetype plugin

Commit: 
https://github.com/vim/vim/commit/3704b5b58ace1163522188e3228996c15e56820e
Author: Phạm Bình An <phambinhanctb2...@gmail.com>
Date:   Sat May 10 21:20:57 2025 +0200

    runtime(tutor): improve tutor.vim plugin and filetype plugin
    
    - Set g:tutor_debug on startup if it doesn't exist so that users can get
      cmdline completion when interactively setting it.
    - set b:undo_ftplugin in filetype plugin
    - set default runtime file headers
    
    closes: #17274
    
    Signed-off-by: Phạm Bình An <phambinhanctb2...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/ftplugin/tutor.vim b/runtime/ftplugin/tutor.vim
index 30783d979..5660cbf64 100644
--- a/runtime/ftplugin/tutor.vim
+++ b/runtime/ftplugin/tutor.vim
@@ -1,4 +1,11 @@
-" vim: fdm=marker
+" Tutor filetype plugin
+" Language:    Tutor (the new tutor plugin)
+" Maintainer:  This runtime file is looking for a new maintainer.
+" Last Change: 2025 May 10
+" Contributors:        Phạm Bình An <phambinhanctb2...@gmail.com>
+" Original Author: Felipe Morales <hel.sh...@gmail.com>
+" Last Change:
+" 2025 May 10 set b:undo_ftplugin
 
 " Base: {{{1
 call tutor#SetupVim()
@@ -43,3 +50,10 @@ if !exists('g:tutor_debug') || g:tutor_debug == 0
     call tutor#ApplyMarks()
     autocmd! TextChanged,TextChangedI <buffer> call tutor#ApplyMarksOnChanged()
 endif
+
+let b:undo_ftplugin = 'unlet! g:tutor_debug |'
+let b:undo_ftplugin ..= 'setl concealcursor< conceallevel< |'
+let b:undo_ftplugin ..= 'setl foldmethod< foldexpr< foldlevel< |'
+let b:undo_ftplugin ..= 'setl buftype< undofile< keywordprg< iskeyword< |'
+
+" vim: fdm=marker
diff --git a/runtime/plugin/tutor.vim b/runtime/plugin/tutor.vim
index 1411b1ac6..b79ba9309 100644
--- a/runtime/plugin/tutor.vim
+++ b/runtime/plugin/tutor.vim
@@ -1,6 +1,17 @@
+" Tutor:       New Style Tutor Plugin :h vim-tutor-mode
+" Maintainer:  This runtime file is looking for a new maintainer.
+" Contributors:        Phạm Bình An <phambinhanctb2...@gmail.com>
+" Original Author: Felipe Morales <hel.sh...@gmail.com>
+" Date: 2025 May 10
+
 if exists('g:loaded_tutor_mode_plugin') || &compatible
     finish
 endif
 let g:loaded_tutor_mode_plugin = 1
 
+" Define this variable so that users get cmdline completion.
+if !exists('g:tutor_debug')
+  let g:tutor_debug = 0
+endif
+
 command! -nargs=? -complete=custom,tutor#TutorCmdComplete Tutor call 
tutor#TutorCmd(<q-args>)

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