patch 9.1.0446: getregionpos() inconsistent for partly-selected multibyte char

Commit: 
https://github.com/vim/vim/commit/ef73374dc3e4bf8104ba31d5b22517f8028b467a
Author: zeertzjq <zeert...@outlook.com>
Date:   Sun May 26 18:42:18 2024 +0200

    patch 9.1.0446: getregionpos() inconsistent for partly-selected multibyte 
char
    
    Problem:  getregionpos() behaves inconsistently for a partly-selected
              multibyte char.
    Solution: Always use column of the first byte for a partly-selected
              multibyte char (zeertzjq).
    
    closes: #14851
    
    Signed-off-by: zeertzjq <zeert...@outlook.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/evalfunc.c b/src/evalfunc.c
index b389085ed..d53dda457 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -5788,6 +5788,7 @@ f_getregionpos(typval_T *argvars, typval_T *rettv)
     for (lnum = p1.lnum; lnum <= p2.lnum; lnum++)
     {
        pos_T           ret_p1, ret_p2;
+       char_u          *line = ml_get(lnum);
        colnr_T         line_len = ml_get_len(lnum);
 
        if (region_type == MLINE)
@@ -5810,7 +5811,7 @@ f_getregionpos(typval_T *argvars, typval_T *rettv)
            {
                if (region_type == MBLOCK)
                {
-                   ret_p1.col = bd.textcol;
+                   ret_p1.col = mb_prevptr(line, bd.textstart) - line + 1;
                    ret_p1.coladd = bd.start_char_vcols
                                             - (bd.start_vcol - oa.start_vcol);
                }
@@ -5829,7 +5830,7 @@ f_getregionpos(typval_T *argvars, typval_T *rettv)
            }
            else if (bd.startspaces > 0)
            {
-               ret_p1.col = bd.textcol;
+               ret_p1.col = mb_prevptr(line, bd.textstart) - line + 1;
                ret_p1.coladd = bd.start_char_vcols - bd.startspaces;
            }
            else
diff --git a/src/testdir/test_visual.vim b/src/testdir/test_visual.vim
index e1c7cf5f7..95ac9a6a8 100644
--- a/src/testdir/test_visual.vim
+++ b/src/testdir/test_visual.vim
@@ -2073,10 +2073,12 @@ func Test_visual_getregion()
           \ getregion(getpos('v'), getpos('.'), {'type': "\<C-v>" }))
     call assert_equal([
           \   [[bufnr('%'), 1, 5, 0], [bufnr('%'), 1, 5, 0]],
-          \   [[bufnr('%'), 2, 10, 1], [bufnr('%'), 2, 10, 2]],
+          \   [[bufnr('%'), 2, 7, 1], [bufnr('%'), 2, 7, 2]],
           \   [[bufnr('%'), 3, 5, 0], [bufnr('%'), 3, 5, 0]],
           \ ],
           \ getregionpos(getpos('v'), getpos('.'), {'type': "\<C-v>" }))
+    call assert_equal(['efghijk«', '🇦«🇧«🇨«🇩', '12345'],
+          \ getregion(getpos('v'), getpos('.'), {'type': 'v' }))
     call assert_equal([
           \   [[bufnr('%'), 1, 5, 0], [bufnr('%'), 1, 13, 0]],
           \   [[bufnr('%'), 2, 1, 0], [bufnr('%'), 2, 22, 0]],
@@ -2084,6 +2086,28 @@ func Test_visual_getregion()
           \ ],
           \ getregionpos(getpos('v'), getpos('.'), {'type': 'v' }))
 
+    call cursor(1, 5)
+    call feedkeys("\<Esc>\<C-v>5l2j", 'xt')
+    call assert_equal(['efghij', ' «🇨« ', '567890'],
+          \ getregion(getpos('v'), getpos('.'), {'type': "\<C-v>" }))
+    call assert_equal([
+          \   [[bufnr('%'), 1, 5, 0], [bufnr('%'), 1, 10, 0]],
+          \   [[bufnr('%'), 2, 7, 1], [bufnr('%'), 2, 19, 1]],
+          \   [[bufnr('%'), 3, 5, 0], [bufnr('%'), 3, 10, 0]],
+          \ ],
+          \ getregionpos(getpos('v'), getpos('.'), {'type': "\<C-v>" }))
+
+    call cursor(1, 4)
+    call feedkeys("\<Esc>\<C-v>02j", 'xt')
+    call assert_equal(['abcd', '🇦« ', '1234'],
+          \ getregion(getpos('v'), getpos('.'), {'type': "\<C-v>" }))
+    call assert_equal([
+          \   [[bufnr('%'), 1, 1, 0], [bufnr('%'), 1, 4, 0]],
+          \   [[bufnr('%'), 2, 1, 0], [bufnr('%'), 2, 7, 1]],
+          \   [[bufnr('%'), 3, 1, 0], [bufnr('%'), 3, 4, 0]],
+          \ ],
+          \ getregionpos(getpos('v'), getpos('.'), {'type': "\<C-v>" }))
+
     #" characterwise selection with multibyte chars
     call cursor(1, 1)
     call feedkeys("\<Esc>vj", 'xt')
diff --git a/src/version.c b/src/version.c
index ae37647ac..ac0bda070 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 */
+/**/
+    446,
 /**/
     445,
 /**/

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