vim-patch:8.2.3615: wrong indent in first line if re-formatting with indent expr

Problem:    When re-formatting with an indent expression the first line of a
            paragraph may get the wrong indent. (Martin F. Krafft)
Solution:   Apply the correct indenting function for the first line.
            (Christian Brabandt, closes vim/vim#9150, closes vim/vim#9056)
https://github.com/vim/vim/commit/818ff25cd1aabf60b9cd239da2f1328a959954f7

1 files changed, 12 insertions, 1 deletions

diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index a8198cfce9..cd7ae25a20 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -4547,9 +4547,20 @@ void format_lines(linenr_T line_count, int avoid_fex)
        */
       if (is_end_par || force_format) {
         if (need_set_indent) {
+          int indent = 0;  // amount of indent needed
+
           // replace indent in first line with minimal number of
           // tabs and spaces, according to current options
-          (void)set_indent(get_indent(), SIN_CHANGED);
+          if (curbuf->b_p_lisp) {
+            indent = get_lisp_indent();
+          } else {
+            if (cindent_on()) {
+              indent = *curbuf->b_p_inde != NUL ? get_expr_indent() : get_c_indent();
+            } else {
+              indent = get_indent();
+            }
+          }
+          (void)set_indent(indent, SIN_CHANGED);
         }
 
         // put cursor on last non-space