vim-patch:8.2.3386: using uninitialized memory

Problem:    Using uninitialized memory.
Solution:   Initialize the rm_ic field. (Dominique Pellé, closes vim/vim#8800)
a918712626

src/nvim/indent.c

@@ -474,6 +474,7 @@ int get_breakindent_win(win_T *wp, char_u *line)
     };
 
     if (regmatch.regprog != NULL) {
+      regmatch.rm_ic = false;
       if (vim_regexec(&regmatch, line, 0)) {
         if (wp->w_briopt_list > 0) {
           bri += wp->w_briopt_list;