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

patches/patchinstall.sh

@@ -373,6 +373,7 @@ patch_enable_all ()
 	enable_user32_PNG_Support="$1"
 	enable_user32_Refresh_MDI_Menus="$1"
 	enable_user32_ScrollWindowEx="$1"
+	enable_user32_ShowWindow="$1"
 	enable_user32_Sorted_Listbox="$1"
 	enable_user32_WM_MEASUREITEM="$1"
 	enable_user32_lpCreateParams="$1"
@@ -1343,6 +1344,9 @@ patch_enable ()
 		user32-ScrollWindowEx)
 			enable_user32_ScrollWindowEx="$2"
 			;;
+		user32-ShowWindow)
+			enable_user32_ShowWindow="$2"
+			;;
 		user32-Sorted_Listbox)
 			enable_user32_Sorted_Listbox="$2"
 			;;
@@ -7793,6 +7797,21 @@ if test "$enable_user32_ScrollWindowEx" -eq 1; then
 	) >> "$patchlist"
 fi
 
+# Patchset user32-ShowWindow
+# |
+# | This patchset fixes the following Wine bugs:
+# |   *	[#39731] Fix handling of ShowWindow when window is already visible
+# |
+# | Modified files:
+# |   *	dlls/user32/winpos.c
+# |
+if test "$enable_user32_ShowWindow" -eq 1; then
+	patch_apply user32-ShowWindow/0001-user32-ShowWindow-should-not-send-message-when-windo.patch
+	(
+		printf '%s\n' '+    { "Kimmo Myllyvirta", "user32: ShowWindow should not send message when window is already visible.", 1 },';
+	) >> "$patchlist"
+fi
+
 # Patchset user32-WM_MEASUREITEM
 # |
 # | This patchset fixes the following Wine bugs:

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