Update runtime files

runtime/doc/todo.txt

@@ -38,12 +38,17 @@ browser use: https://github.com/vim/vim/issues/1234
 							*known-bugs*
 -------------------- Known bugs and current work -----------------------
 
-cmdheight=0:
-- :g/pattern should not use message window  #11012
+When using :echomessage do use msg_row and msg_col, but save and restore.
+How to test any failure?
 
-*.sil detection with FTsil() (lacygoill, Aug 25)
+Improve :defer command:
+    - Use "D" flag of writefile() in tests.
+    - test "defer func()->funcouter()" fails (or use "funcouter")
+    - test "defer func().arg" fails
+    - test partial fails
+    - check arguments at :defer command
+    - Also when function does "qa!" or "cq"?
 
-Avoid using "Xfile" and "Xdir" in tests, use specific names.
 
 Further Vim9 improvements, possibly after launch:
 - Use Vim9 for more runtime files.
@@ -183,10 +188,7 @@ Terminal emulator window:
 - When 'encoding' is not utf-8, or the job is using another encoding, setup
   conversions.
 
-Cleanup:
-- Remove FEAT_FOOTER ?
-
-Add 'splitscroll'  #10682  Useful?  Any remaining trouble?
+Add 'splitscroll'  #10682  Anything remaining
 
 Autoconf: must use autoconf 2.69, later version generates lots of warnings
 - try using autoconf 2.71 and fix all "obsolete" warnings
@@ -196,6 +198,8 @@ Can deref_func_name() and deref_function_name() be merged?
 After patch 8.2.4915 w_botline is computed much more often. Can this be
 reduced?
 
+Add BufDeletePost.  #11041
+
 NFA regexp does not handle composing characters well: #10286
     [ɔ̃] matches both ɔ and ɔ̃
     \(ɔ\|ɔ̃\) matches ɔ and not ɔ̃
@@ -3753,6 +3757,7 @@ Syntax highlighting:
     - use treesitter, NeoVim uses it - Many people don't like it.
 	After changes requires rebuilding the library.
     - use TextMate, vscode uses it.  #9087 - Other people don't like it.
+	    https://github.com/icedman/vim-textmate
       Vscode is asked to switch to treesitter:
       https://github.com/microsoft/vscode/issues/50140
     - sublime grammar?