Merge pull request #6076 from lonerover/vim-7.4.2275

vim-patch: 7.4.2275,7.4.2279

src/nvim/diff.c

@@ -1007,6 +1007,10 @@ void ex_diffsplit(exarg_T *eap)
   bufref_T old_curbuf;
   set_bufref(&old_curbuf, curbuf);
 
+  // Need to compute w_fraction when no redraw happened yet.
+  validate_cursor();
+  set_fraction(curwin);
+
   // don't use a new tab page, each tab page has its own diffs
   cmdmod.tab = 0;
 
@@ -1032,6 +1036,9 @@ void ex_diffsplit(exarg_T *eap)
               curwin->w_cursor.lnum);
         }
       }
+      // Now that lines are folded scroll to show the cursor at the same
+      // relative position.
+      scroll_to_fraction(curwin, curwin->w_height);
     }
   }
 }
@@ -1154,10 +1161,13 @@ void ex_diffoff(exarg_T *eap)
         }
 
         foldUpdateAll(wp);
-
-        // make sure topline is not halfway through a fold
-        changed_window_setting_win(wp);
       }
+      // remove filler lines
+      wp->w_topfill = 0;
+
+      // make sure topline is not halfway a fold and cursor is
+      // invalidated
+      changed_window_setting_win(wp);
 
       // Note: 'sbo' is not restored, it's a global option.
       diff_buf_adjust(wp);

src/nvim/testdir/test_diffmode.vim

@@ -202,3 +202,19 @@ func Test_diffget_diffput()
   bwipe!
   enew!
 endfunc
+
+func Test_diffoff()
+  enew!
+  call setline(1, ['Two', 'Three'])
+  let normattr = screenattr(1, 1)
+  diffthis
+  botright vert new
+  call setline(1, ['One', '', 'Two', 'Three'])
+  diffthis
+  redraw
+  diffoff!
+  redraw
+  call assert_equal(normattr, screenattr(1, 1))
+  bwipe!
+  bwipe!
+endfunc

src/nvim/version.c

@@ -161,11 +161,11 @@ static int included_patches[] = {
   // 2282 NA
   // 2281 NA
   // 2280,
-  // 2279,
+  2279,
   // 2278 NA
   2277,
   // 2276,
-  // 2275,
+  2275,
   2274,
   2273,
   2272,

src/nvim/window.c

@@ -4717,8 +4717,6 @@ void set_fraction(win_T *wp)
  */
 void win_new_height(win_T *wp, int height)
 {
-  linenr_T lnum;
-  int sline, line_size;
   int prev_height = wp->w_height;
 
   /* Don't want a negative height.  Happens when splitting a tiny window.
@@ -4745,6 +4743,15 @@ void win_new_height(win_T *wp, int height)
   wp->w_height = height;
   wp->w_skipcol = 0;
 
+  scroll_to_fraction(wp, prev_height);
+}
+
+void scroll_to_fraction(win_T *wp, int prev_height)
+{
+    linenr_T lnum;
+    int sline, line_size;
+    int height = wp->w_height;
+
   /* Don't change w_topline when height is zero.  Don't set w_topline when
    * 'scrollbind' is set and this isn't the current window. */
   if (height > 0