runtime(yaml): fix wrong order of undo_ftplugin suboptions

Commit: 
https://github.com/vim/vim/commit/229f79c1683fa52159e692ff8b53449e117a38b2
Author: Vincent Law <v...@users.noreply.github.com>
Date:   Tue Apr 22 20:35:11 2025 +0200

    runtime(yaml): fix wrong order of undo_ftplugin suboptions
    
    This commit fixes the following error message:
    ```
    Compiler not supported: make inc< sw< sts<
    ```
    
    1. orginal value: `setl com< cms< et< fo<| compiler make inc< sw< sts<`
    2. correct value: `setl com< cms< et< fo< inc< sw< sts< | compiler make`
    
    While at it, let's also document the g:yaml_recommended_style variable.
    
    closes: #17179
    
    Co-authored-by: Christian Brabandt <c...@256bit.org>
    Signed-off-by: Vincent Law <v...@users.noreply.github.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/filetype.txt b/runtime/doc/filetype.txt
index 77bf5f337..018dbcaf1 100644
--- a/runtime/doc/filetype.txt
+++ b/runtime/doc/filetype.txt
@@ -1,4 +1,4 @@
-*filetype.txt* For Vim version 9.1.  Last change: 2025 Apr 19
+*filetype.txt* For Vim version 9.1.  Last change: 2025 Apr 22
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1043,6 +1043,13 @@ functions with [[ and ]].  Move around comments with ]" 
and [".
 The mappings can be disabled with: >
        let g:no_vim_maps = 1
 
+YAML                                                   *ft-yaml-plugin*
+By default, the YAML filetype plugin enables the following options: >
+       setlocal shiftwidth=2 softtabstop=2
+
+To disable this, set the following variable: >
+       let g:yaml_recommended_style = 0
+
 
 ZIG                                                    *ft-zig-plugin*
 
diff --git a/runtime/doc/tags b/runtime/doc/tags
index d51afbf0e..636977084 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -7531,6 +7531,7 @@ ft-xml-omni       insert.txt      /*ft-xml-omni*
 ft-xml-syntax  syntax.txt      /*ft-xml-syntax*
 ft-xpm-syntax  syntax.txt      /*ft-xpm-syntax*
 ft-yaml-indent indent.txt      /*ft-yaml-indent*
+ft-yaml-plugin filetype.txt    /*ft-yaml-plugin*
 ft-yaml-syntax syntax.txt      /*ft-yaml-syntax*
 ft-zig-plugin  filetype.txt    /*ft-zig-plugin*
 ft-zimbu-plugin        filetype.txt    /*ft-zimbu-plugin*
diff --git a/runtime/ftplugin/yaml.vim b/runtime/ftplugin/yaml.vim
index 4e12350c2..12036a86a 100644
--- a/runtime/ftplugin/yaml.vim
+++ b/runtime/ftplugin/yaml.vim
@@ -1,7 +1,8 @@
 " Vim filetype plugin file
 " Language:             YAML (YAML Ain't Markup Language)
 " Previous Maintainer:  Nikolai Weibull <n...@bitwi.se> (inactive)
-" Last Change:  2024 Oct 04
+" Last Change:          2024 Oct 04
+" 2025 Apr 22 by Vim project re-order b:undo_ftplugin (#17179)
 
 if exists("b:did_ftplugin")
   finish
@@ -16,20 +17,25 @@ let b:undo_ftplugin = "setl com< cms< et< fo<"
 setlocal comments=:# commentstring=#\ %s expandtab
 setlocal formatoptions-=t formatoptions+=croql
 
-" rime input method engine uses `*.custom.yaml` as its config files
+if get(g:, "yaml_recommended_style",1)
+  let b:undo_ftplugin ..= " sw< sts<"
+  setlocal shiftwidth=2 softtabstop=2
+endif
+
+" rime input method engine(https://rime.im/)
+" uses `*.custom.yaml` as its config files
 if expand('%:r:e') ==# 'custom'
+  " `__include` command in `*.custom.yaml`
+  " see: https://github.com/rime/home/wiki/Configuration#%E5%8C%85%E5%90%AB
+  setlocal include=__include:\s*
+  let b:undo_ftplugin ..= " inc<"
+
   if !exists('current_compiler')
     compiler rime_deployer
-    let b:undo_ftplugin ..= "| compiler make"
+    let b:undo_ftplugin ..= " | compiler make"
   endif
-  setlocal include=__include:\s*
-  let b:undo_ftplugin ..= " inc<"
 endif
 
-if !exists("g:yaml_recommended_style") || g:yaml_recommended_style != 0
-  let b:undo_ftplugin ..= " sw< sts<"
-  setlocal shiftwidth=2 softtabstop=2
-endif
 
 let &cpo = s:cpo_save
 unlet s:cpo_save

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