vim-patch:8.1.1327: unnecessary scroll after horizontal split

Problem:    Unnecessary scroll after horizontal split.
Solution:   Don't adjust to fraction if all the text fits in the window.
            (Martin Kunev, closes vim/vim#4367)
a9b2535f44

src/nvim/testdir/test_window_cmd.vim

@@ -756,6 +756,42 @@ func Test_relative_cursor_second_line_after_resize()
   let &so = so_save
 endfunc
 
+func Test_split_noscroll()
+  let so_save = &so
+  new
+  only
+
+  " Make sure windows can hold all content after split.
+  for i in range(1, 20)
+    wincmd +
+    redraw!
+  endfor
+
+  call setline (1, range(1, 8))
+  normal 100%
+  split
+
+  1wincmd w
+  let winid1 = win_getid()
+  let info1 = getwininfo(winid1)[0]
+
+  2wincmd w
+  let winid2 = win_getid()
+  let info2 = getwininfo(winid2)[0]
+
+  call assert_equal(1, info1.topline)
+  call assert_equal(1, info2.topline)
+
+  " Restore original state.
+  for i in range(1, 20)
+    wincmd -
+    redraw!
+  endfor
+  only!
+  bwipe!
+  let &so = so_save
+endfunc
+
 " Tests for the winnr() function
 func Test_winnr()
   only | tabonly

src/nvim/window.c

@@ -5610,10 +5610,13 @@ void scroll_to_fraction(win_T *wp, int prev_height)
     int sline, line_size;
     int height = wp->w_height_inner;
 
-    // Don't change w_topline when height is zero.  Don't set w_topline when
+  // Don't change w_topline in any of these cases:
-    // 'scrollbind' is set and this isn't the current window.
+  // - window height is 0
+  // - 'scrollbind' is set and this isn't the current window
+  // - window height is sufficient to display the whole buffer
   if (height > 0
       && (!wp->w_p_scb || wp == curwin)
+      && (height < wp->w_buffer->b_ml.ml_line_count)
       ) {
     /*
      * Find a value for w_topline that shows the cursor at the same