vim-patch:9.0.1476: lines put in non-current window are not displayed (#23265)

Problem:    Lines put in non-current window are not displayed. (Marius
            Gedminas)
Solution:   Don't increment the topline when inserting just above it.
            (closes vim/vim#12212)

https://github.com/vim/vim/commit/e7f05a8780426dc7af247419c6d02d5f1e896689

Co-authored-by: Bram Moolenaar <Bram@vim.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/src/nvim/mark.c b/src/nvim/mark.c
index 59ff3026b3..7b79081dd9 100644
--- a/src/nvim/mark.c
+++ b/src/nvim/mark.c
@@ -1100,12 +1100,12 @@ void ex_changes(exarg_T *eap)
     } \
   }
 
-// Adjust marks between line1 and line2 (inclusive) to move 'amount' lines.
+// Adjust marks between "line1" and "line2" (inclusive) to move "amount" lines.
 // Must be called before changed_*(), appended_lines() or deleted_lines().
 // May be called before or after changing the text.
-// When deleting lines line1 to line2, use an 'amount' of MAXLNUM: The marks
-// within this range are made invalid.
-// If 'amount_after' is non-zero adjust marks after line2.
+// When deleting lines "line1" to "line2", use an "amount" of MAXLNUM: The
+// marks within this range are made invalid.
+// If "amount_after" is non-zero adjust marks after "line2".
 // Example: Delete lines 34 and 35: mark_adjust(34, 35, MAXLNUM, -2);
 // Example: Insert two lines below 55: mark_adjust(56, MAXLNUM, 2, 0);
 //                                 or: mark_adjust(56, 55, MAXLNUM, 2);
@@ -1240,7 +1240,9 @@ static void mark_adjust_internal(linenr_T line1, linenr_T line2, linenr_T amount
             } else {
               win->w_topline = line1 - 1;
             }
-          } else {                      // keep topline on the same line
+          } else if (win->w_topline > line1) {
+            // keep topline on the same line, unless inserting just
+            // above it (we probably want to see that line then)
             win->w_topline += amount;
           }
           win->w_topfill = 0;