patch 8.1.1456: WinBar not redrawn after scrolling one line

Problem:    WinBar not redrawn after scrolling one line.
Solution:   Exclude the winbar height when deciding what to redraw.
            (closes #4473)
diff --git a/src/screen.c b/src/screen.c
index 8c97e88..37999bb 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -645,7 +645,7 @@
 		type = CLEAR;
 	    FOR_ALL_WINDOWS(wp)
 	    {
-		if (W_WINROW(wp) < msg_scrolled)
+		if (wp->w_winrow < msg_scrolled)
 		{
 		    if (W_WINROW(wp) + wp->w_height > msg_scrolled
 			    && wp->w_redr_type < REDRAW_TOP
diff --git a/src/testdir/test_winbar.vim b/src/testdir/test_winbar.vim
index a34c29e..c0b43b9 100644
--- a/src/testdir/test_winbar.vim
+++ b/src/testdir/test_winbar.vim
@@ -110,3 +110,15 @@
 
   bwipe!
 endfunc
+
+func Test_redraw_after_scroll()
+  new
+  amenu 1.10 WinBar.Next :let g:did_next = 11<CR>
+  redraw
+  call assert_equal("  Next", Screenline(1))
+  echo "some\nmore"
+  redraw
+  call assert_equal("  Next", Screenline(1))
+  bwipe!
+endfunc
+
diff --git a/src/version.c b/src/version.c
index 13961d4..29006c1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1456,
+/**/
     1455,
 /**/
     1454,