Patch 9.0.1555
Problem:    setcharsearch() does not clear last searched char properly.
Solution:   Do not accept lastc_bytelen smaller than one. (closes #12398)
Files:      src/search.c, src/testdir/test_charsearch.vim,
            src/testdir/test_charsearch_utf8.vim


*** ../vim-9.0.1554/src/search.c        2023-05-06 19:19:59.428601312 +0100
--- src/search.c        2023-05-14 17:35:01.042956228 +0100
***************
*** 496,502 ****
  }
  
      void
! set_last_csearch(int c, char_u *s UNUSED, int len UNUSED)
  {
      *lastc = c;
      lastc_bytelen = len;
--- 496,502 ----
  }
  
      void
! set_last_csearch(int c, char_u *s, int len)
  {
      *lastc = c;
      lastc_bytelen = len;
***************
*** 1789,1795 ****
      }
      else              // repeat previous search
      {
!       if (*lastc == NUL && lastc_bytelen == 1)
            return FAIL;
        if (dir)        // repeat in opposite direction
            dir = -lastcdir;
--- 1789,1795 ----
      }
      else              // repeat previous search
      {
!       if (*lastc == NUL && lastc_bytelen <= 1)
            return FAIL;
        if (dir)        // repeat in opposite direction
            dir = -lastcdir;
***************
*** 1833,1839 ****
                        return FAIL;
                    col -= (*mb_head_off)(p, p + col - 1) + 1;
                }
!               if (lastc_bytelen == 1)
                {
                    if (p[col] == c && stop)
                        break;
--- 1833,1839 ----
                        return FAIL;
                    col -= (*mb_head_off)(p, p + col - 1) + 1;
                }
!               if (lastc_bytelen <= 1)
                {
                    if (p[col] == c && stop)
                        break;
*** ../vim-9.0.1554/src/testdir/test_charsearch.vim     2022-08-30 
19:48:17.206760205 +0100
--- src/testdir/test_charsearch.vim     2023-05-14 17:35:01.042956228 +0100
***************
*** 38,43 ****
--- 38,45 ----
    " clear the character search
    call setcharsearch({'char' : ''})
    call assert_equal('', getcharsearch().char)
+   call assert_beeps('normal ;')
+   call assert_beeps('normal ,')
  
    call assert_fails("call setcharsearch([])", 'E1206:')
    enew!
*** ../vim-9.0.1554/src/testdir/test_charsearch_utf8.vim        2019-01-24 
16:36:06.000000000 +0000
--- src/testdir/test_charsearch_utf8.vim        2023-05-14 17:35:01.042956228 
+0100
***************
*** 13,18 ****
--- 13,25 ----
    call assert_equal([0, 1, 43, 0], getpos('.'))
    normal! ,
    call assert_equal([0, 1, 28, 0], getpos('.'))
+   call assert_equal('最', getcharsearch().char)
+   call setcharsearch({'char' : ''})
+   call assert_equal('', getcharsearch().char)
+   call assert_beeps('normal ;')
+   call assert_equal([0, 1, 28, 0], getpos('.'))
+   call assert_beeps('normal ,')
+   call assert_equal([0, 1, 28, 0], getpos('.'))
    bw!
  endfunc
  
*** ../vim-9.0.1554/src/version.c       2023-05-14 17:24:18.148997087 +0100
--- src/version.c       2023-05-14 17:37:35.670702296 +0100
***************
*** 697,698 ****
--- 697,700 ----
  {   /* Add new patch number below this line */
+ /**/
+     1555,
  /**/

-- 
hundred-and-one symptoms of being an internet addict:
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    have neutral nicknames and you never bothered to ask.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
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