patch 8.0.1123: cannot define a toolbar for a window

Problem:    Cannot define a toolbar for a window.
Solution:   Add a window-local toolbar.
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index b979c97..169d84f 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -201,12 +201,13 @@
 	    test_viminfo.res \
 	    test_vimscript.res \
 	    test_visual.res \
+	    test_winbar.res \
 	    test_window_id.res \
+	    test_windows_home.res \
 	    test_writefile.res \
 	    test_alot_latin.res \
 	    test_alot_utf8.res \
-	    test_alot.res \
-	    test_windows_home.res
+	    test_alot.res
 
 
 # Explicit dependencies.
diff --git a/src/testdir/test_winbar.vim b/src/testdir/test_winbar.vim
new file mode 100644
index 0000000..1961607
--- /dev/null
+++ b/src/testdir/test_winbar.vim
@@ -0,0 +1,23 @@
+" Test WinBar
+
+if !has('menu')
+  finish
+endif
+
+func Test_add_remove_menu()
+  new
+  amenu 1.10 WinBar.Next :let g:did_next = 11<CR>
+  amenu 1.20 WinBar.Cont :let g:did_cont = 12<CR>
+  emenu WinBar.Next
+  call assert_equal(11, g:did_next)
+  emenu WinBar.Cont
+  call assert_equal(12, g:did_cont)
+
+  wincmd w
+  call assert_fails('emenu WinBar.Next', 'E334')
+  wincmd p
+
+  aunmenu WinBar.Next
+  aunmenu WinBar.Cont
+  close
+endfunc