vim-patch:8.2.2177: pattern "^" does not match if first character is combining

Problem:    Pattern "^" does not match if the first character in the line is
            combining. (Rene Kita)
Solution:   Do accept a match at the start of the line. (closes vim/vim#6963)
ef2dff52de

src/nvim/regexp_nfa.c

@@ -5243,9 +5243,12 @@ static int nfa_regmatch(nfa_regprog_T *prog, nfa_state_T *start,
       switch (t->state->c) {
       case NFA_MATCH:
       {
-        // If the match ends before a composing characters and
-        // rex.reg_icombine is not set, that is not really a match.
-        if (!rex.reg_icombine && utf_iscomposing(curc)) {
+        // If the match is not at the start of the line, ends before a
+        // composing characters and rex.reg_icombine is not set, that
+        // is not really a match.
+        if (!rex.reg_icombine
+            && rex.input != rex.line
+            && utf_iscomposing(curc)) {
           break;
         }
         nfa_match = true;

src/nvim/testdir/test_regexp_utf8.vim

@@ -533,4 +533,15 @@ func Test_search_with_end_offset()
   close!
 endfunc
 
+" Check that "^" matches even when the line starts with a combining char
+func Test_match_start_of_line_combining()
+  new
+  call setline(1, ['', "\u05ae", ''])
+  exe "normal gg/^\<CR>"
+  call assert_equal(2, getcurpos()[1])
+  bwipe!
+endfunc
+
+
+
 " vim: shiftwidth=2 sts=2 expandtab