1 files changed, 23 insertions, 16 deletions

diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index dccc3e6324..05ca402d39 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -1623,8 +1623,9 @@ int op_delete(oparg_T *oap)
             );
         curwin->w_cursor = curpos;              /* restore curwin->w_cursor */
       }
-      if (curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count)
-        (void)do_join(2, FALSE, FALSE, FALSE);
+      if (curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count) {
+        do_join(2, FALSE, FALSE, FALSE, false);
+      }
     }
   }
 
@@ -3381,15 +3382,19 @@ static char_u *skip_comment(char_u *line, int process, int include_space, int *i
   return line;
 }
 
-/*
- * Join 'count' lines (minimal 2) at cursor position.
- * When "save_undo" is TRUE save lines for undo first.
- * Set "use_formatoptions" to FALSE when e.g. processing
- * backspace and comment leaders should not be removed.
- *
- * return FAIL for failure, OK otherwise
- */
-int do_join(long count, int insert_space, int save_undo, int use_formatoptions)
+// Join 'count' lines (minimal 2) at cursor position.
+// When "save_undo" is TRUE save lines for undo first.
+// Set "use_formatoptions" to FALSE when e.g. processing backspace and comment
+// leaders should not be removed.
+// When setmark is true, sets the '[ and '] mark, else, the caller is expected
+// to set those marks.
+//
+// return FAIL for failure, OK otherwise
+int do_join(long count,
+            int insert_space,
+            int save_undo,
+            int use_formatoptions,
+            bool setmark)
 {
   char_u      *curr = NULL;
   char_u      *curr_start = NULL;
@@ -3427,7 +3432,7 @@ int do_join(long count, int insert_space, int save_undo, int use_formatoptions)
    */
   for (t = 0; t < count; ++t) {
     curr = curr_start = ml_get((linenr_T)(curwin->w_cursor.lnum + t));
-    if (t == 0) {
+    if (t == 0 && setmark) {
       // Set the '[ mark.
       curwin->w_buffer->b_op_start.lnum = curwin->w_cursor.lnum;
       curwin->w_buffer->b_op_start.col = (colnr_T)STRLEN(curr);
@@ -3527,9 +3532,11 @@ int do_join(long count, int insert_space, int save_undo, int use_formatoptions)
   }
   ml_replace(curwin->w_cursor.lnum, newp, FALSE);
 
-  // Set the '] mark.
-  curwin->w_buffer->b_op_end.lnum = curwin->w_cursor.lnum;
-  curwin->w_buffer->b_op_end.col = (colnr_T)STRLEN(newp);
+  if (setmark) {
+    // Set the '] mark.
+    curwin->w_buffer->b_op_end.lnum = curwin->w_cursor.lnum;
+    curwin->w_buffer->b_op_end.col = (colnr_T)STRLEN(newp);
+  }
 
   /* Only report the change in the first line here, del_lines() will report
    * the deleted line. */
@@ -3953,7 +3960,7 @@ format_lines (
           }
         }
         curwin->w_cursor.lnum--;
-        if (do_join(2, TRUE, FALSE, FALSE) == FAIL) {
+        if (do_join(2, TRUE, FALSE, FALSE, false) == FAIL) {
           beep_flush();
           break;
         }