--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -1,4 +1,4 @@
-*todo.txt*      For Vim version 8.2.  Last change: 2022 May 22
+*todo.txt*      For Vim version 8.2.  Last change: 2022 Jun 03
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -39,20 +39,14 @@ browser use: https://github.com/vim/vim/
 -------------------- Known bugs and current work -----------------------
 
 Prepare for Vim 9.0 release:
+- Update the user manual:
+  - Add import/export example to 52.1
+  - Add more to usr_50.txt as an "advanced section" of usr_41.txt
+  - Move some from vim9.txt to the user manual?  Keep the specification.
 - Use Vim9 for more runtime files.
-- Check Vim9 code coverage, add more tests if needed.
-	vim9instr.c
-	vim9script.c
-	vim9type.c
+- Make popup-examples use Vim9 script  Issue #10499
 - Adjust intro message to say "help version9".
 
-Update the user manual:
-- Update usr_41.txt for Vim9 script
-- Fill usr_50.txt as an "advanced section" of usr_41.txt
-  Add links from usr_41 to usr_50.
-- Make usr_51.txt use Vim9 script.  Still need usr_52.txt?
-
-
 Further Vim9 improvements, possibly after launch:
 - Check performance with callgrind and kcachegrind.
     getline()/substitute()/setline() in #5632
@@ -89,9 +83,9 @@ Update list of features to vote on:
 Popup windows:
 - Preview popup not properly updated when it overlaps with completion menu.
     (Yegappan Lakshmanan, 2021 May 22
+- Srollbar thumb somtimes not visible  #10492
 - Add a function to redraw a specific popup window.  Esp. to be used when
   editing the command line, when screen updating doesn't happen. (Shougo)
-- In some cases prop_remove() does not work correctly. (#8261)
 - Add a flag to make a popup window focusable?
     CTRL-W P cycle over any preview window or focusable popup, end up back in
 	     current window.
@@ -152,6 +146,9 @@ Prompt buffer:
 - add prompt_addtext({buf}, {expr})	none	add text to a prompt buffer
 
 Terminal debugger:
+- Add a mechanism for configuration.  Instead of several global variables use
+  a dictionary.  Use callbacks for some things, e.g. opening a debug window in
+  a certain position.
 - Make prompt-buffer variant work better.
 - Add option to not open the program window.  It's not used when attaching to
   an already running program. (M. Kelly)
@@ -207,13 +204,8 @@ Terminal emulator window:
 - When 'encoding' is not utf-8, or the job is using another encoding, setup
   conversions.
 
-Add autocmd functions. PR #10291
-  a couple of outstanding comments, wait for Yegappan to respond
-
 Can deref_func_name() and deref_function_name() be merged?
 
-Add mode bits to maparg() dict?  PR #10356
-
 After patch 8.2.4915 w_botline is computed much more often. Can this be
 reduced?
 
@@ -228,11 +220,6 @@ entry separately. #6609
 Multiplexers (screen, tmux) can request it to the underlaying terminal, and
 pass it on with modifications.
 
-Test_communicate_ipv6(): is flaky on many systems
-Fails in line 64 of Ch_communicate, no exception is thrown.
-
-Rename getdigraphlist -> digraph_getlist() etc.
-
 Can "CSI nr X" be used instead of outputting spaces?  Is it faster?  #8002
 
 Valgrind reports memory leaks in test_options.
@@ -255,8 +242,6 @@ Memory leaks in test_channel? (or is it 
 
 PR to support %e and %k in 'errorformat'. #9624
 
-PR to add left and right bitwise shift. #8457
-
 Idea: when typing ":e /some/dir/" and "dir" does not exist, highlight in red.
 
 ":set &shellpipe" and ":set &shellredir" should use the logic from
@@ -276,8 +261,6 @@ Add support for "underdouble", "underdot
 
 test_arglist func Test_all_not_allowed_from_cmdwin() hangs on MS-Windows.
 
-Mapping with partial match not executed properly in GTK. (Ingo Karkat, #7082)
-
 Information for a specific terminal (e.g. gnome, tmux, konsole, alacritty) is
 spread out.  Make a section with copy/paste examples of script and pointers to
 more information.
@@ -294,6 +277,8 @@ Request to use "." for the cursor column
 
 ":filter set termcap" only filters terminal codes, not keys. (#9297)
 
+Add an option to restrict 'incsearch' to not scroll the view. (Tavis Ormandy)
+
 Remove SPACE_IN_FILENAME ? It is only used for completion.
 
 When 'term' starts with "foot" then default t_TI and t_TE to the values used
@@ -316,9 +301,6 @@ to tell which value from getvvcol() shou
 Value returned by virtcol() changes depending on how lines wrap.  This is
 inconsistent with the documentation.
 
-Making breakat support multibyte characters (Yasuhiro Matsumoto, #6598)
-Scroll doesn't work correctly, why?
-
 globpath() does not use 'wildignorecase' at all? (related to #8350)
 
 Add 'termguiattr' option, use "gui=" attributes in the terminal?  Would work
@@ -360,9 +342,6 @@ Should also work without any group:
 Should add a match/str/list/pos method that also returns the test and position
 of submatches.  #8355
 
-Syntax highlight for a region does not work with a "nextgroup" if the start
-match is empty. #8449
-
 Check out PR #543 (Roland Puntaier).
 Patch for multibyte characters in langmap and applying a mapping on them.
 (Christian Brabandt, 2015 Jun 12, update July 25)
@@ -485,9 +464,6 @@ Sound: support on Mac?  Or does libcanbe
 
 Python 3.8 doesn't work. (Antonios Hadjigeorgalis, #5509)
 
-The :syntax cchar value can only be a single character.  It would be useful to
-support combining characters. (Charles Campbell)  Also #4687
-
 "--cleanFOO" does not result in an error. (#5537)
 
 Output from assert_equalfile() doesn't give a hint about what's different.
@@ -803,13 +779,6 @@ Compiler warning (geeknik, 2017 Oct 26):
 Add Native language protocol server (LSP) support. (Yegappan Lakshmanan, 2018
 Oct 28)
 
-Add more testing of the GTK GUI.
-- gtk_test_widget_click() can be used to simulate a click in a widget.
-
-Tests failing for "make testgui" with GTK:
-- Test_setbufvar_options()
-- Test_exit_callback_interval()
-
 Patch to be able to use hex numbers with :digraph. (Lcd, 2015 Sep 6)
 Update Sep 7.  Update by Christian Brabandt, 2015 Sep 8, 2016 Feb 1.
 Patch to be able to disable default digraphs (incomplete) (Eric Pruitt, 2018
@@ -939,9 +908,6 @@ Patch to support hunspell. (Matej Cepl, 
 in #846)
 Doesn't work on Windows yet.  Not ready to included, hard coded paths.
 
-Win32 GUI: when running a fast timer, the cursor no longer blinks.
-Was reported: cursor blinks in terminal on widows with a timer. (xtal8, #2142)
-
 When a timer is running and typing CTRL-R on the command line, it is not
 redrawn properly. (xtal8, 2017 Oct 23, #2241)
 
@@ -1104,10 +1070,6 @@ Suggestion to improve pt-br spell checki
 
 Error in test_startup_utf8 on Solaris. (Danek Duvall, 2016 Aug 17)
 
-GTK: When adding a timer from 'balloonexpr' it won't fire, because
-g_main_context_iteration() doesn't return.  Need to trigger an event when the
-timer expires.
-
 Rule to use "^" for statusline does not work if a space is defined with
 highlighting for both stl and stlnc.  Patch by Ken Hamada (itchyny, 2016 Dec 11)
 
@@ -1507,8 +1469,6 @@ Result of systemlist() does not show whe
 When in 'comments' "n:x" follows after three-part comment directly it repeats
 any one-character from the previous line. (Kartik Agaram, 2014 Sep 19)
 
-Syntax highlighting slow (hangs) in SASS file. (Niek Bosch, 2013 Aug 21)
-
 Adding "~" to 'cdpath' doesn't work for completion?  (Davido, 2013 Aug 19)
 
 Patch: Let rare word highlighting overrule good word highlighting.
@@ -1630,9 +1590,6 @@ Also see #2034.
 
 Patch to define macros for hardcoded values. (Elias Diem, 2013 Dec 14)
 
-Several syntax file match "^\s*" which may get underlined if that's in the
-highlight group.  Add a "\zs" after it?
-
 Updated spec ftplugin. (Matěj Cepl, 2013 Oct 16)
 
 Patch to handle integer overflow. (Aaron Burrow, 2013 Dec 12)
@@ -1654,9 +1611,6 @@ When evaluating expression in backticks,
 Using <nr>ifoobar<esc> can slow down Vim.  Patch by Christian Brabandt, 2013
 Dec 13.  Only helps a bit, 10000ii<Esc> is still too slow.
 
-GTK: problem with 'L' in 'guioptions' changing the window width.
-(Aaron Cornelius, 2012 Feb 6)
-
 Javascript file where indent gets stuck on: GalaxyMaster, 2012 May 3.
 
 The BufUnload event is triggered when re-using the empty buffer.
@@ -1682,9 +1636,6 @@ 2013 Mar 19, later message)
 
 Patch to view coverage of the tests. (Nazri Ramliy, 2013 Feb 15)
 
-Patch to invert characters differently in GTK. (Yukihiro Nakadaira, 2013 May
-5)
-
 Patch to add "Q" and "A" responses to interactive :substitute. They are
 carried over when using :global. (Christian Brabandt, 2013 Jun 19)
 
@@ -1704,13 +1655,6 @@ Patch by Christian Brabandt, 2013 Apr 20
 
 Bug: findfile("any", "file:///tmp;") does not work.
 
-patch to add "combine" flag to  syntax commands. (so8res, 2012 Dec 6)
-Patch to add "combine" to :syntax, combines highlight attributes. (Nate
-Soares, 2012 Dec 3)
-
-Syntax update problem in one buffer opened in two windows, bottom window is
-not correctly updated. (Paul Harris, 2012 Feb 27)
-
 Patch to add getsid(). (Tyru, 2011 Oct 2)  Do we want this?  Update Oct 4.
 Or use expand('<sid>')?
 
@@ -1814,10 +1758,6 @@ 2012 Jun 19)
 Patch 7.3.116 was the wrong solution.
 Christian Brabandt has another incomplete patch. (2011 Jul 13)
 
-Syntax region with 'concealends' and a 'cchar' value, 'conceallevel' set to 2,
-only one of the two ends gets the cchar displayed. (Brett Stahlman, 2010 Aug
-21, Ben Fritz, 2010 Sep 14)
-
 Win32: Patch to use task dialogs when available. (Sergiu Dotenco, 2011 Sep 17)
 New feature, requires testing.  Made some remarks.
 
@@ -1879,18 +1819,12 @@ the help file.
 After patch 7.3.097 still get E15. (Yukihiro Nakadaira, 2011 Jan 18)
 Also for another example (ZyX, 2011 Jan 24)
 
-Build problem with small features on Mac OS X 10.6. (Rainer, 2011 Jan 24)
-
 "0g@$" puts '] on last byte of multibyte. (ZyX, 2011 Jan 22)
 
 Patch for :tabrecently. (Hirokazu Yoshida, 2012 Jan 30)
 
 Problem with "syn sync grouphere". (Gustavo Niemeyer, 2011 Jan 27)
 
-Using "syn sync breaklines=2" works for when text is changed, but not when
-scrolling or redrawing.  Should start search for syntax patterns above the
-first drawn line. (#8103)
-
 Loading autoload script even when usage is inside "if 0". (Christian Brabandt,
 2010 Dec 18)
 
@@ -1923,19 +1857,12 @@ In the sandbox it's not allowed to do ma
 or set variables.  Add a way to prevent variables from being changed in the
 sandbox?  E.g.: ":protect g:restore_settings".
 
-GTK: drawing a double-width combining character over single-width characters
-doesn't look right. (Dominique Pelle, 2010 Aug 8)
-
-GTK: tear-off menu does not work. (Kurt Sonnenmoser, 2010 Oct 25)
-
 Win32: tear-off menu does not work when menu language is German. (Markus
 Bossler, 2011 Mar 2)  Fixed by 7.3.095?
 
 Wish for NetBeans commands:
     - make it possible to have 'defineAnnoType' also handle terminal colors.
 
-Version of netbeans.c for use with MacVim. (Kazuki Sakamoto, 2010 Nov 18)
-
 7.3.014 changed how backslash at end of line works, but still get a NUL when
 there is one backslash. (Ray Frush, 2010 Nov 18)  What does the original ex
 do?
@@ -2009,8 +1936,6 @@ C-indenting: A matching { in a comment i
 checked to be in a comment.  Implement FM_SKIPCOMM flag of findmatchlimit().
 Issue 46.
 
-Mac with X11: clipboard doesn't work properly. (Raf, 2010 Aug 16)
-
 Using CompilerSet doesn't record where an option was set from.  E.g., in the
 gcc compiler plugin. (Gary Johnson, 2010 Dec 13)
 
@@ -2082,8 +2007,6 @@ Problem with stop directory in findfile(
 Using ']' as the end of a range in a pattern requires double escaping:
      /[@-\\]]  (Andy Wokula, 2011 Jun 28)
 
-Syntax priority problem. (Charles Campbell, 2011 Sep 15)
-
 For running gvim on a USB stick: avoid the OLE registration.  Use a command
 line argument -noregister.
 
@@ -2139,8 +2062,6 @@ J.  Wang, 2009 Mar 31)
 When $VIMRUNTIME is set in .vimrc, need to reload lang files.  Already done
 for GTK, how about others? (Ron Aaron, 2010 Apr 10)
 
-Patch for GTK buttons X1Mouse and X2Mouse. (Christian J. Robinson, 2010 Aug 9)
-
 ":tab split fname" doesn't set the alternate file in the original window,
 because win_valid() always returns FALSE.  Below win_new_tabpage() in
 ex_docmd.c.
@@ -2174,9 +2095,6 @@ displayed in a window should return the 
 
 Diff mode out of sync. (Gary Johnson, 2010 Aug 4)
 
-Win32 GUI: last message from startup doesn't show up when there is an echoerr
-command. (Cyril Slobin, 2009 Mar 13)
-
 Win32: completion of file name ":e c:\!test" results in ":e c:\\!test", which
 does not work. (Nieko Maatjes, 2009 Jan 8, Ingo Karkat, 2009 Jan 22)
 
@@ -2316,10 +2234,6 @@ Win32: Using "gvim --remote-tab-silent elŝuti.txt" doesn't work, the
 multibyte character isn't passed and edits elsuti.txt.
 (Raúl Núñez de Arenas Coronado, 2015 Dec 18)
 
-Problem with 'langmap' being used on the rhs of a mapping. (Nikolai Weibull,
-2008 May 14)
-Possibly related problem: Alexey Muranov, 2015 Apr 2
-
 Problem with CTRL-F. (Charles Campbell, 2008 March 21)
 Only happens with "gvim -geometry "160x26+4+27" -u NONE -U NONE prop.c".
 'lines' is 54. (2008 March 27)
@@ -2346,21 +2260,6 @@ line doesn't fit. (Dasn, 2008 May 1)
 GUI: In Normal mode can't yank the modeless selection.  Make "gy" do this?
 Works like CTRL-Y in Command line mode.
 
-Mac: Move Carbon todo items to os_mac.txt.  Note that this version is frozen,
-try the Cocoa version.
-
-Mac: After a ":vsplit" the left scrollbar doesn't appear until 'columns' is
-changed or the window is resized.
-
-GTK: when setting 'columns' in a startup script and doing ":vertical diffsplit"
-the window isn't redrawn properly, see two vertical bars.
-
-Mac: Patch for configure: remove arch from ruby link args. (Knezevic, 2008
-Mar 5)  Alternative: Kazuki Sakamoto, Mar 7.
-
-Mac: trouble compiling with Motif, requires --disable-darwin. (Raf, 2008 Aug
-1)  Reply by Ben Schmidt.
-
 C't: On utf-8 system, editing file with umlaut through Gnome results in URL
 with %nn%nn, which is taken as two characters instead of one.
 Try to reproduce at work.
@@ -2380,10 +2279,6 @@ Would be more consistent when an existin
 Using Aap to build Vim: add remarks about how to set personal preferences.
 Example on http://www.calmar.ws/tmp/aap.html
 
-Syntax highlighting wrong for transparent region. (Doug Kearns, 2007 Feb 26)
-Bug in using a transparent syntax region. (Hanlen in vim-dev maillist, 2007
-Jul 31)
-
 When 'diffopt' has "context:0" a single deleted line causes two folds to merge
 and mess up syncing. (Austin Jennings, 2008 Jan 31)
 
@@ -2592,8 +2487,6 @@ Jul 22)
 
 There should be something about spell checking in the user manual.
 
-Mac: Using gvim: netrw window disappears. (Nick Lo, 2006 Jun 21)
-
 Add an option to specify the character to use when a double-width character is
 moved to the next line.  Default '>', set to a space to blank it out.  Check
 that char is single width when it's set (compare with 'listchars').
@@ -2644,8 +2537,6 @@ Only skip shortening for ":cc"?
 Problem with ":call" and dictionary function. Hari Krishna Dara, Charles
 Campbell 2006 Jul 06.
 
-Syntax HL error caused by "containedin". (Peter Hodge, 2006 Oct 6)
-
 A custom completion function in a ":command" cannot be a Funcref. (Andy
 Wokula, 2007 Aug 25)
 
@@ -2678,18 +2569,9 @@ and <notisdir> to autocommand patterns? 
 Add command modifier that skips wildcard expansion, so that you don't need to
 put backslashes before special chars, only for white space.
 
-Syntax HL: open two windows on the same C code, delete a ")" in one window,
-resulting in highlighted "{" in that window, not in the other.
-
 In mswin.vim: Instead of mapping <C-V> for Insert mode in a complicated way,
 can it be done like ":imap <C-V> <MiddleMouse>" without negative side effects?
 
-GTK: when the Tab pages bar appears or disappears while the window is
-maximized the window is no longer maximized.  Patch that has some idea but
-doesn't work from Geoffrey Antos, 2008 May 5.
-Also: the window may no longer fit on the screen, thus the command line is not
-visible.
-
 When right after "vim file", "M" then CTRL-W v the windows are scrolled
 differently and unexpectedly.  Caused by patch 7.2.398?
 
@@ -2718,9 +2600,6 @@ When completing from another file that u
 text has the wrong encoding.  E.g., when 'encoding' is utf-8 and file is
 latin1.  Example from Gombault Damien, 2007 Mar 24.
 
-Syntax HL: When using "nextgroup" and the group has an empty match, there is
-no search at that position for another match. (Lukas Mai, 2008 April 11)
-
 In gvim the backspace key produces a backspace character, but on Linux the
 VERASE key is Delete.  Set VERASE to Backspace? (patch by Stephane Chazelas,
 2007 Oct 16)
@@ -2741,9 +2620,6 @@ When switching between windows the curso
 Remember the relative position and restore that, just like lnum and col are
 restored. (Luc St-Louis)
 
-Patch to support horizontal scroll wheel in GTK. Untested. (Bjorn Winckler,
-2010 Jun 30)
-
 Add an option for a minimal text length before inserting a line break for
 'textwidth'.  Avoids very short lines when a very long word follows.
 (Kartik Agaram)
@@ -2982,7 +2858,7 @@ 6   Vi compatibility (optional): make "i
     thing.  (only repeat insert for the first line).
 
 
-GTK+ GUI known bugs:
+GTK+ GUI:
 9   Crash with X command server over ssh. (Ciaran McCreesh, 2006 Feb 6)
 8   GTK 2: Combining UTF-8 characters not displayed properly in menus (Mikolaj
     Machowski)  They are displayed as separate characters.  Problem in
@@ -2997,6 +2873,33 @@ 9   Can't paste a Visual selection from 
 -   Gnome2: When moving the toolbar out of the dock, so that it becomes
     floating, it can no longer be moved.  Therefore making it float has been
     blocked for now.
+-   Mapping with partial match not executed properly in GTK. (Ingo Karkat,
+    #7082)
+-   Add more testing of the GTK GUI.
+    - gtk_test_widget_click() can be used to simulate a click in a widget.
+-   Tests failing for "make testgui" with GTK:
+    - Test_setbufvar_options()
+    - Test_exit_callback_interval()
+-   When adding a timer from 'balloonexpr' it won't fire, because
+    g_main_context_iteration() doesn't return.  Need to trigger an event when
+    the timer expires.
+-   problem with 'L' in 'guioptions' changing the window width.  (Aaron
+    Cornelius, 2012 Feb 6)
+-   Patch to invert characters differently in GTK. (Yukihiro Nakadaira, 2013
+    May 5)
+-   drawing a double-width combining character over single-width characters
+    doesn't look right. (Dominique Pelle, 2010 Aug 8)
+-   tear-off menu does not work. (Kurt Sonnenmoser, 2010 Oct 25)
+-   Patch for GTK buttons X1Mouse and X2Mouse. (Christian J. Robinson, 2010
+    Aug 9)
+-   When setting 'columns' in a startup script and doing ":vertical diffsplit"
+    the window isn't redrawn properly, see two vertical bars.
+-   when the Tab pages bar appears or disappears while the window is maximized
+    the window is no longer maximized.  Patch that has some idea but doesn't
+    work from Geoffrey Antos, 2008 May 5.  Also: the window may no longer fit
+    on the screen, thus the command line is not visible.
+-   Patch to support horizontal scroll wheel in GTK. Untested. (Bjorn
+    Winckler, 2010 Jun 30)
 
 
 Win32 GUI known bugs:
@@ -3062,6 +2965,10 @@ 8   When gui_init_font() is called with 
     still be used somewhere.  This is too tricky, do the font selection first,
     then set the new font by name (requires putting all logfont parameters in
     the font name).
+-   When running a fast timer, the cursor no longer blinks.  Was reported:
+    cursor blinks in terminal on widows with a timer. (xtal8, #2142)
+-   Last message from startup doesn't show up when there is an echoerr
+    command. (Cyril Slobin, 2009 Mar 13)
 
 
 Motif:
@@ -3242,6 +3149,18 @@ 8   Define mch_writable() for Macintosh.
 9   When DiskLock is running, using a swap file causes a crash.  Appears to be
     a problem with writing a file that starts with a dot. (Giacalone)
 9   In mac_expandpath() check that handling of backslashes is done properly.
+-   Build problem with small features on Mac OS X 10.6. (Rainer, 2011 Jan 24)
+-   Version of netbeans.c for use with MacVim. (Kazuki Sakamoto, 2010 Nov 18)
+-   Mac with X11: clipboard doesn't work properly. (Raf, 2010 Aug 16)
+-   Move Carbon todo items to os_mac.txt.  Note that this version is frozen,
+    try the Cocoa version.
+-   After a ":vsplit" the left scrollbar doesn't appear until 'columns' is
+    changed or the window is resized.
+-   Patch for configure: remove arch from ruby link args. (Knezevic, 2008 Mar
+    5)  Alternative: Kazuki Sakamoto, Mar 7.
+-   trouble compiling with Motif, requires --disable-darwin. (Raf, 2008 Aug 1)
+    Reply by Ben Schmidt.
+-   Using gvim: netrw window disappears. (Nick Lo, 2006 Jun 21)
 
 
 "Small" problems:
@@ -3899,6 +3818,8 @@ 7   Use ideas for nl_langinfo() from Mar
     table anymore (breakat_flags[]).
     Simplistic solution: when 'formatoptions' contains "m" also break a line
     at a multibyte character >= 0x100.
+    Making breakat support multibyte characters (Yasuhiro Matsumoto, #6598)
+    Scroll doesn't work correctly, why?
 -   Add the possibility to enter mappings which are used whenever normal text
     could be entered.  E.g., for "f" command.  But not in Normal mode.  Sort
     of opposite of 'langmap'.  Use ":amap" command?
@@ -3906,6 +3827,9 @@ 7   Use ideas for nl_langinfo() from Mar
     account.  The "linebreak" program from Bruno Haible can do it:
     ftp://ftp.ilog.fr/pub/Users/haible/gnu/linebreak-0.1.tar.gz
     But it's very complicated...
+-   Problem with 'langmap' being used on the rhs of a mapping. (Nikolai
+    Weibull, 2008 May 14).
+    Possibly related problem: Alexey Muranov, 2015 Apr 2
 
 
 Printing:
@@ -3929,8 +3853,8 @@ 8   Make the foreground color darkening 
 
 Syntax highlighting:
     Long term goal: faster, better, etc.  Options:
-    - use treesitter, NeoVim uses it
-    - use TextMate, vscode uses it.  #9087
+    - use treesitter, NeoVim uses it - Many people don't like it.
+    - use TextMate, vscode uses it.  #9087 - possibly a long term solution
 8   Make ":syn off" use 'runtimepath' instead of $VIMRUNTIME. (Gary Johnson)
     Should do the same for ":syn on" and ":syn manual".
 8   Support "containedin" argument for ":syn include", so that the defined
@@ -4079,6 +4003,34 @@ 8   Make a version that works like less,
     text, exit at end of file, don't allow editing, etc.  moreim?  lessim?
 7   SpecialKey highlighting overrules syntax highlighting.  Can't give an
     unprintable char another color.  Would be useful for ^M at end of line.
+-   Syntax highlight for a region does not work with a "nextgroup" if the
+    start match is empty. #8449
+-   The :syntax cchar value can only be a single character.  It would be
+    useful to support combining characters. (Charles Campbell)  Also #4687
+-   Syntax highlighting slow (hangs) in SASS file. (Niek Bosch, 2013 Aug 21)
+-   Several syntax file match "^\s*" which may get underlined if that's in the
+    highlight group.  Add a "\zs" after it?
+-   patch to add "combine" flag to  syntax commands. (so8res, 2012 Dec 6)
+    Patch to add "combine" to :syntax, combines highlight attributes. (Nate
+    Soares, 2012 Dec 3)
+-   Syntax update problem in one buffer opened in two windows, bottom window
+    is not correctly updated. (Paul Harris, 2012 Feb 27)
+-   Syntax region with 'concealends' and a 'cchar' value, 'conceallevel' set
+    to 2, only one of the two ends gets the cchar displayed. (Brett Stahlman,
+    2010 Aug 21, Ben Fritz, 2010 Sep 14)
+-   Using "syn sync breaklines=2" works for when text is changed, but not when
+    scrolling or redrawing.  Should start search for syntax patterns above the
+    first drawn line. (#8103)
+-   Syntax priority problem. (Charles Campbell, 2011 Sep 15)
+-   Syntax highlighting wrong for transparent region. (Doug Kearns, 2007 Feb
+    26)
+-   Bug in using a transparent syntax region. (Hanlen in vim-dev maillist,
+    2007 Jul 31)
+-   Syntax HL error caused by "containedin". (Peter Hodge, 2006 Oct 6)
+-   Open two windows on the same C code, delete a ")" in one window, resulting
+    in highlighted "{" in that window, not in the other.
+-   When using "nextgroup" and the group has an empty match, there is no
+    search at that position for another match. (Lukas Mai, 2008 April 11)
 
 
 Vim script language: