vim-patch:8.1.1498: ":write" increments b:changedtick even though nothing changed

Problem:    ":write" increments b:changedtick even though nothing changed.
            (Daniel Hahler)
Solution:   Only increment b:changedtick if the modified flag is reset.
https://github.com/vim/vim/commit/c024b4667875e5bc6fd0ed791530e33c3161bff7

1 files changed, 8 insertions, 4 deletions

diff --git a/src/nvim/change.c b/src/nvim/change.c
index f8a4cf4282..3401f8a0a8 100644
--- a/src/nvim/change.c
+++ b/src/nvim/change.c
@@ -478,9 +478,11 @@ changed_lines(
   }
 }
 
-/// Called when the changed flag must be reset for buffer "buf".
-/// When "ff" is true also reset 'fileformat'.
-void unchanged(buf_T *buf, int ff)
+/// Called when the changed flag must be reset for buffer `buf`.
+/// When `ff` is true also reset 'fileformat'.
+/// When `always_inc_changedtick` is true b:changedtick is incremented even
+/// when the changed flag was off.
+void unchanged(buf_T *buf, int ff, bool always_inc_changedtick)
 {
   if (buf->b_changed || (ff && file_ff_differs(buf, false))) {
     buf->b_changed = false;
@@ -491,8 +493,10 @@ void unchanged(buf_T *buf, int ff)
     check_status(buf);
     redraw_tabline = true;
     need_maketitle = true;  // set window title later
+    buf_inc_changedtick(buf);
+  } else if (always_inc_changedtick) {
+    buf_inc_changedtick(buf);
   }
-  buf_inc_changedtick(buf);
 }
 
 /// Insert string "p" at the cursor position.  Stops at a NUL byte.