Added patch to fix handling of ShowWindow when window is already visible.

patches/user32-ShowWindow/0001-user32-ShowWindow-should-not-send-message-when-windo.patch

@@ -0,0 +1,27 @@
+From 33f637536046687bc533370397ed7fc704eaa0e2 Mon Sep 17 00:00:00 2001
+From: Kimmo Myllyvirta <kimmo.myllyvirta@gmail.com>
+Date: Fri, 28 Apr 2017 15:28:55 +0200
+Subject: user32: ShowWindow should not send message when window is already
+ visible.
+
+---
+ dlls/user32/winpos.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/dlls/user32/winpos.c b/dlls/user32/winpos.c
+index c2b35ec1f5..64fdfe01b0 100644
+--- a/dlls/user32/winpos.c
++++ b/dlls/user32/winpos.c
+@@ -1239,6 +1239,9 @@ BOOL WINAPI ShowWindow( HWND hwnd, INT cmd )
+     if ((cmd == SW_HIDE) && !(GetWindowLongW( hwnd, GWL_STYLE ) & WS_VISIBLE))
+         return FALSE;
+ 
++    if ((cmd == SW_SHOW) && (GetWindowLongW( hwnd, GWL_STYLE ) & WS_VISIBLE))
++        return TRUE;
++
+     return SendMessageW( hwnd, WM_WINE_SHOWWINDOW, cmd, 0 );
+ }
+ 
+-- 
+2.12.2
+

patches/user32-ShowWindow/definition

@@ -0,0 +1 @@
+Fixes: [39731] Fix handling of ShowWindow when window is already visible