From b5fc21dbf05874ef7901a5e66f39612c46a698e3 Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <janedmundlazo@hotmail.com>
Date: Tue, 21 Aug 2018 12:33:00 -0400
Subject: vim-patch:8.0.1707: when 'wfh' is set ":bel 10new" scrolls window

Problem:    When 'wfh' is set ":bel 10new" scrolls window. (Andrew Pyatkov)
Solution:   Set the fraction before changing the window height. (closes vim/vim#2798)
https://github.com/vim/vim/commit/98da6ecab905df48a67da36ce60233f45726c979
---
 src/nvim/window.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/nvim/window.c b/src/nvim/window.c
index d9903338e8..89ab2c2b9c 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -565,6 +565,7 @@ int win_split_ins(int size, int flags, win_T *new_wp, int dir)
   int before;
   int minheight;
   int wmh1;
+  bool did_set_fraction = false;
 
   if (flags & WSP_TOP)
     oldwin = firstwin;
@@ -729,6 +730,11 @@ int win_split_ins(int size, int flags, win_T *new_wp, int dir)
      * 'winfixheight' window.  Take them from a window above or below
      * instead, if possible. */
     if (oldwin->w_p_wfh) {
+      // Set w_fraction now so that the cursor keeps the same relative
+      // vertical position using the old height.
+      set_fraction(oldwin);
+      did_set_fraction = true;
+
       win_setheight_win(oldwin->w_height + new_size + STATUS_HEIGHT,
           oldwin);
       oldwin_height = oldwin->w_height;
@@ -843,7 +849,9 @@ int win_split_ins(int size, int flags, win_T *new_wp, int dir)
 
   /* Set w_fraction now so that the cursor keeps the same relative
    * vertical position. */
-  set_fraction(oldwin);
+  if (!did_set_fraction) {
+    set_fraction(oldwin);
+  }
   wp->w_fraction = oldwin->w_fraction;
 
   if (flags & WSP_VERT) {
-- 
cgit