patch 9.1.0864: message history is fixed to 200

Commit: 
https://github.com/vim/vim/commit/4bd9b2b2467e696061104a029000e9824c6c609e
Author: Shougo Matsushita <shougo.ma...@gmail.com>
Date:   Thu Nov 14 22:31:48 2024 +0100

    patch 9.1.0864: message history is fixed to 200
    
    Problem:  message history is fixed to 200
    Solution: Add the 'msghistory' option, increase the default
              value to 500 (Shougo Matsushita)
    
    closes: #16048
    
    Co-authored-by: Milly <milly...@gmail.com>
    Signed-off-by: Shougo Matsushita <shougo.ma...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/message.txt b/runtime/doc/message.txt
index 6453b95fa..69d8bc7c6 100644
--- a/runtime/doc/message.txt
+++ b/runtime/doc/message.txt
@@ -1,4 +1,4 @@
-*message.txt*   For Vim version 9.1.  Last change: 2024 Mar 13
+*message.txt*   For Vim version 9.1.  Last change: 2024 Nov 14
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -29,7 +29,7 @@ depends on the 'shortmess' option.
                                Clear messages, keeping only the {count} most
                                recent ones.
 
-The number of remembered messages is fixed at 200.
+The number of remembered messages is determined by the 'msghistory' option.
 
                                                                *g<*
 The "g<" command can be used to see the last page of previous command output.
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 73ff7cc60..1aa5cccf7 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -4440,7 +4440,8 @@ A jump table for the options with a short description can 
be found at |Q_op|.
                        global
        A history of ":" commands, and a history of previous search patterns
        is remembered.  This option decides how many entries may be stored in
-       each of these histories (see |cmdline-editing|).
+       each of these histories (see |cmdline-editing| and 'msghistory' for
+       the number of messages to remember).
        The maximum value is 10000.
        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.
@@ -5917,6 +5918,12 @@ A jump table for the options with a short description 
can be found at |Q_op|.
        time in msec between two mouse clicks for the second click to be
        recognized as a multi click.
 
+                                               *'msghistory'* *'mhi'*
+'msghistory' 'mhi'     number  (default 500)
+                       global
+       Determines how many entries are remembered in the |:messages| history.
+       The maximum value is 10000.
+
                                                    *'mzquantum'* *'mzq'*
 'mzquantum' 'mzq'      number  (default 100)
                        global
diff --git a/runtime/doc/tags b/runtime/doc/tags
index 00c131d80..86db8a41d 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -501,6 +501,7 @@ $quote      eval.txt        /*$quote*
 'mesg' vi_diff.txt     /*'mesg'*
 'mfd'  options.txt     /*'mfd'*
 'mh'   options.txt     /*'mh'*
+'mhi'  options.txt     /*'mhi'*
 'mis'  options.txt     /*'mis'*
 'mkspellmem'   options.txt     /*'mkspellmem'*
 'ml'   options.txt     /*'ml'*
@@ -531,6 +532,7 @@ $quote      eval.txt        /*$quote*
 'mousetime'    options.txt     /*'mousetime'*
 'mp'   options.txt     /*'mp'*
 'mps'  options.txt     /*'mps'*
+'msghistory'   options.txt     /*'msghistory'*
 'msm'  options.txt     /*'msm'*
 'mzq'  options.txt     /*'mzq'*
 'mzquantum'    options.txt     /*'mzquantum'*
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index ac0700ed7..10e13f846 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2024 Nov 11
+*version9.txt*  For Vim version 9.1.  Last change: 2024 Nov 14
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41659,6 +41659,7 @@ Options: ~
                        popup
 'findfunc'             Vim function to obtain the results for a |:find|
                        command
+'msghistory'           Max number of messages to remember
 'winfixbuf'            Keep buffer focused in a window
 'tabclose'             Which tab page to focus after closing a tab page
 't_xo'                 Terminal uses XON/XOFF handshaking (e.g. vt420)
diff --git a/runtime/optwin.vim b/runtime/optwin.vim
index 99b1ecfd2..c8170da71 100644
--- a/runtime/optwin.vim
+++ b/runtime/optwin.vim
@@ -749,6 +749,8 @@ call <SID>AddOption("terse", gettext("add 's' flag in 
'shortmess' (don't show se
 call <SID>BinOptionG("terse", &terse)
 call <SID>AddOption("shortmess", gettext("list of flags to make messages 
shorter"))
 call <SID>OptionG("shm", &shm)
+call <SID>AddOption("msghistory", gettext("how many messages are remembered"))
+call append("$", "     set mhi=" . &mhi)
 call <SID>AddOption("showcmd", gettext("show (partial) command keys in 
location given by 'showcmdloc'"))
 let &sc = s:old_sc
 call <SID>BinOptionG("sc", &sc)
diff --git a/src/feature.h b/src/feature.h
index 5fcd727a9..bcfc4a40c 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -137,11 +137,6 @@
  *                     main window area.
  */
 
-/*
- * Message history is fixed at 200 messages.
- */
-#define MAX_MSG_HIST_LEN 200
-
 /*
  * +folding            Fold lines.
  */
diff --git a/src/message.c b/src/message.c
index 576d92268..5853e471f 100644
--- a/src/message.c
+++ b/src/message.c
@@ -1013,7 +1013,7 @@ add_msg_hist(
        return;
 
     // Don't let the message history get too big
-    while (msg_hist_len > MAX_MSG_HIST_LEN)
+    while (msg_hist_len > p_mhi)
        (void)delete_first_msg();
 
     // allocate an entry and add the message at the end of the history
diff --git a/src/option.c b/src/option.c
index dcb5752e1..4616d63d3 100644
--- a/src/option.c
+++ b/src/option.c
@@ -4914,6 +4914,16 @@ check_num_option_bounds(
        errmsg = e_invalid_argument;
        p_hi = 10000;
     }
+    if (p_mhi < 0)
+    {
+       errmsg = e_argument_must_be_positive;
+       p_mhi = 0;
+    }
+    else if (p_mhi > 10000)
+    {
+       errmsg = e_invalid_argument;
+       p_mhi = 10000;
+    }
     if (p_re < 0 || p_re > 2)
     {
        errmsg = e_invalid_argument;
diff --git a/src/option.h b/src/option.h
index d5f72a1cc..18a7c2ad5 100644
--- a/src/option.h
+++ b/src/option.h
@@ -794,6 +794,7 @@ EXTERN int  p_mousemev;     // 'mousemoveevent'
 #endif
 EXTERN long    p_mouset;       // 'mousetime'
 EXTERN int     p_more;         // 'more'
+EXTERN long    p_mhi;          // 'msghistory'
 #ifdef FEAT_MZSCHEME
 EXTERN long    p_mzq;          // 'mzquantum
 # if defined(DYNAMIC_MZSCHEME)
diff --git a/src/optiondefs.h b/src/optiondefs.h
index 585604fb3..81bb1db40 100644
--- a/src/optiondefs.h
+++ b/src/optiondefs.h
@@ -1778,6 +1778,9 @@ static struct vimoption options[] =
     {"mousetime",   "mouset",  P_NUM|P_VI_DEF,
                            (char_u *)&p_mouset, PV_NONE, NULL, NULL,
                            {(char_u *)500L, (char_u *)0L} SCTX_INIT},
+    {"msghistory","mhi",    P_NUM|P_VI_DEF,
+                           (char_u *)&p_mhi, PV_NONE, NULL, NULL,
+                           {(char_u *)500L, (char_u *)0L} SCTX_INIT},
     {"mzquantum",  "mzq",   P_NUM,
 #ifdef FEAT_MZSCHEME
                            (char_u *)&p_mzq, PV_NONE, did_set_mzquantum, NULL,
diff --git a/src/testdir/gen_opt_test.vim b/src/testdir/gen_opt_test.vim
index afea28b7e..ac9401eca 100644
--- a/src/testdir/gen_opt_test.vim
+++ b/src/testdir/gen_opt_test.vim
@@ -85,6 +85,7 @@ let test_values = {
       \ 'imstyle': [[0, 1], [-1, 2, 999]],
       \ 'lines': [[2, 24, 1000], [-1, 0, 1]],
       \ 'linespace': [[-1, 0, 2, 4, 999], ['']],
+      \ 'msghistory': [[0, 1, 100, 10000], [-1, 10001]],
       \ 'numberwidth': [[1, 4, 8, 10, 11, 20], [-1, 0, 21]],
       \ 'regexpengine': [[0, 1, 2], [-1, 3, 999]],
       \ 'report': [[0, 1, 2, 9999], [-1]],
diff --git a/src/testdir/test_options.vim b/src/testdir/test_options.vim
index bd9da730b..09a41f7da 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -732,6 +732,7 @@ func Test_set_option_errors()
   call assert_fails('set backupcopy=', 'E474:')
   call assert_fails('set regexpengine=3', 'E474:')
   call assert_fails('set history=10001', 'E474:')
+  call assert_fails('set msghistory=10001', 'E474:')
   call assert_fails('set numberwidth=21', 'E474:')
   call assert_fails('set colorcolumn=-a', 'E474:')
   call assert_fails('set colorcolumn=a', 'E474:')
@@ -745,6 +746,7 @@ func Test_set_option_errors()
   endif
   call assert_fails('set helpheight=-1', 'E487:')
   call assert_fails('set history=-1', 'E487:')
+  call assert_fails('set msghistory=-1', 'E487:')
   call assert_fails('set report=-1', 'E487:')
   call assert_fails('set shiftwidth=-1', 'E487:')
   call assert_fails('set sidescroll=-1', 'E487:')
diff --git a/src/version.c b/src/version.c
index d0aa4036a..cbc4a8e11 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    864,
 /**/
     863,
 /**/

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