diff --git a/patches/patchinstall.sh b/patches/patchinstall.sh
index 975139ba..fe12565a 100755
--- a/patches/patchinstall.sh
+++ b/patches/patchinstall.sh
@@ -393,6 +393,7 @@ patch_enable_all ()
 	enable_winex11_Clipboard_HTML="$1"
 	enable_winex11_DefaultDisplayFrequency="$1"
 	enable_winex11_SC_KEYMENU="$1"
+	enable_winex11_WM_WINDOWPOSCHANGING="$1"
 	enable_winex11_Window_Groups="$1"
 	enable_winex11_Window_Style="$1"
 	enable_winex11_XEMBED="$1"
@@ -1369,6 +1370,9 @@ patch_enable ()
 		winex11-SC_KEYMENU)
 			enable_winex11_SC_KEYMENU="$2"
 			;;
+		winex11-WM_WINDOWPOSCHANGING)
+			enable_winex11_WM_WINDOWPOSCHANGING="$2"
+			;;
 		winex11-Window_Groups)
 			enable_winex11_Window_Groups="$2"
 			;;
@@ -2038,6 +2042,13 @@ if test "$enable_wpcap_Dynamic_Linking" -eq 1; then
 	enable_wpcap_Several_Fixes=1
 fi
 
+if test "$enable_winex11_WM_WINDOWPOSCHANGING" -eq 1; then
+	if test "$enable_winex11__NET_ACTIVE_WINDOW" -gt 1; then
+		abort "Patchset winex11-_NET_ACTIVE_WINDOW disabled, but winex11-WM_WINDOWPOSCHANGING depends on that."
+	fi
+	enable_winex11__NET_ACTIVE_WINDOW=1
+fi
+
 if test "$enable_wined3d_CSMT_Main" -eq 1; then
 	if test "$enable_wined3d_CSMT_Helper" -gt 1; then
 		abort "Patchset wined3d-CSMT_Helper disabled, but wined3d-CSMT_Main depends on that."
@@ -8235,6 +8246,42 @@ if test "$enable_winex11_SC_KEYMENU" -eq 1; then
 	) >> "$patchlist"
 fi
 
+# Patchset winex11-_NET_ACTIVE_WINDOW
+# |
+# | This patchset fixes the following Wine bugs:
+# |   *	[#2155] Forward activate window requests to WM using _NET_ACTIVE_WINDOW
+# |
+# | Modified files:
+# |   *	dlls/user32/driver.c, dlls/user32/focus.c, dlls/user32/user_private.h, dlls/winex11.drv/event.c,
+# | 	dlls/winex11.drv/window.c, dlls/winex11.drv/winex11.drv.spec, dlls/winex11.drv/x11drv.h, dlls/winex11.drv/x11drv_main.c
+# |
+if test "$enable_winex11__NET_ACTIVE_WINDOW" -eq 1; then
+	patch_apply winex11-_NET_ACTIVE_WINDOW/0001-winex11.drv-Add-support-for-_NET_ACTIVE_WINDOW.patch
+	patch_apply winex11-_NET_ACTIVE_WINDOW/0002-user32-Before-asking-a-WM-to-activate-a-window-make-.patch
+	(
+		echo '+    { "Dmitry Timoshkov", "winex11.drv: Add support for _NET_ACTIVE_WINDOW.", 2 },';
+		echo '+    { "Dmitry Timoshkov", "user32: Before asking a WM to activate a window make sure that the window is in foreground and not minimized.", 1 },';
+	) >> "$patchlist"
+fi
+
+# Patchset winex11-WM_WINDOWPOSCHANGING
+# |
+# | This patchset has the following (direct or indirect) dependencies:
+# |   *	winex11-_NET_ACTIVE_WINDOW
+# |
+# | This patchset fixes the following Wine bugs:
+# |   *	[#34594] Fix handling of WM_WINDOWPOS{CHANGING,CHANGED} for deactivated topmost window
+# |
+# | Modified files:
+# |   *	dlls/winex11.drv/event.c
+# |
+if test "$enable_winex11_WM_WINDOWPOSCHANGING" -eq 1; then
+	patch_apply winex11-WM_WINDOWPOSCHANGING/0001-winex11.drv-Send-WM_WINDOWPOSCHANGING-WM_WINDOWPOSCH.patch
+	(
+		echo '+    { "Dmitry Timoshkov", "winex11.drv: Send WM_WINDOWPOSCHANGING/WM_WINDOWPOSCHANGED messages to a being deactivated topmost window.", 1 },';
+	) >> "$patchlist"
+fi
+
 # Patchset winex11-Window_Groups
 # |
 # | This patchset fixes the following Wine bugs:
@@ -8277,24 +8324,6 @@ if test "$enable_winex11_XEMBED" -eq 1; then
 	) >> "$patchlist"
 fi
 
-# Patchset winex11-_NET_ACTIVE_WINDOW
-# |
-# | This patchset fixes the following Wine bugs:
-# |   *	[#2155] Forward activate window requests to WM using _NET_ACTIVE_WINDOW
-# |
-# | Modified files:
-# |   *	dlls/user32/driver.c, dlls/user32/focus.c, dlls/user32/user_private.h, dlls/winex11.drv/event.c,
-# | 	dlls/winex11.drv/window.c, dlls/winex11.drv/winex11.drv.spec, dlls/winex11.drv/x11drv.h, dlls/winex11.drv/x11drv_main.c
-# |
-if test "$enable_winex11__NET_ACTIVE_WINDOW" -eq 1; then
-	patch_apply winex11-_NET_ACTIVE_WINDOW/0001-winex11.drv-Add-support-for-_NET_ACTIVE_WINDOW.patch
-	patch_apply winex11-_NET_ACTIVE_WINDOW/0002-user32-Before-asking-a-WM-to-activate-a-window-make-.patch
-	(
-		echo '+    { "Dmitry Timoshkov", "winex11.drv: Add support for _NET_ACTIVE_WINDOW.", 2 },';
-		echo '+    { "Dmitry Timoshkov", "user32: Before asking a WM to activate a window make sure that the window is in foreground and not minimized.", 1 },';
-	) >> "$patchlist"
-fi
-
 # Patchset winex11-wglShareLists
 # |
 # | This patchset fixes the following Wine bugs:
diff --git a/patches/winex11-WM_WINDOWPOSCHANGING/0001-winex11.drv-Send-WM_WINDOWPOSCHANGING-WM_WINDOWPOSCH.patch b/patches/winex11-WM_WINDOWPOSCHANGING/0001-winex11.drv-Send-WM_WINDOWPOSCHANGING-WM_WINDOWPOSCH.patch
new file mode 100644
index 00000000..58ade870
--- /dev/null
+++ b/patches/winex11-WM_WINDOWPOSCHANGING/0001-winex11.drv-Send-WM_WINDOWPOSCHANGING-WM_WINDOWPOSCH.patch
@@ -0,0 +1,46 @@
+From 59692b046e936dc25ecab6adaf258533a7404635 Mon Sep 17 00:00:00 2001
+From: Dmitry Timoshkov <dmitry@baikal.ru>
+Date: Tue, 27 Dec 2016 17:45:05 +0800
+Subject: winex11.drv: Send WM_WINDOWPOSCHANGING/WM_WINDOWPOSCHANGED messages
+ to a being deactivated topmost window.
+
+---
+ dlls/winex11.drv/event.c | 13 ++++++++++++-
+ 1 file changed, 12 insertions(+), 1 deletion(-)
+
+diff --git a/dlls/winex11.drv/event.c b/dlls/winex11.drv/event.c
+index bf2cbb07429..e38b76a7274 100644
+--- a/dlls/winex11.drv/event.c
++++ b/dlls/winex11.drv/event.c
+@@ -593,16 +593,27 @@ static void set_input_focus( struct x11drv_win_data *data )
+  */
+ static void set_focus( Display *display, HWND hwnd, Time time )
+ {
+-    HWND focus;
++    HWND focus, old_active;
+     Window win;
+     GUITHREADINFO threadinfo;
+ 
++    old_active = GetForegroundWindow();
++
+     /* prevent recursion */
+     x11drv_thread_data()->active_window = hwnd;
+ 
+     TRACE( "setting foreground window to %p\n", hwnd );
+     SetForegroundWindow( hwnd );
+ 
++    /* Some applications expect that a being deactivated topmost window
++     * receives the WM_WINDOWPOSCHANGING/WM_WINDOWPOSCHANGED messages,
++     * and perform some specific actions. Chessmaster is one of such apps.
++     * Window Manager keeps a topmost window on top in z-oder, so there is
++     * no need to actually do anything, just send the messages.
++     */
++    if (old_active && (GetWindowLongW( old_active, GWL_EXSTYLE ) & WS_EX_TOPMOST))
++        SetWindowPos( old_active, hwnd, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE | SWP_NOOWNERZORDER );
++
+     threadinfo.cbSize = sizeof(threadinfo);
+     GetGUIThreadInfo(0, &threadinfo);
+     focus = threadinfo.hwndFocus;
+-- 
+2.11.0
+
diff --git a/patches/winex11-WM_WINDOWPOSCHANGING/definition b/patches/winex11-WM_WINDOWPOSCHANGING/definition
new file mode 100644
index 00000000..ba4c8c5e
--- /dev/null
+++ b/patches/winex11-WM_WINDOWPOSCHANGING/definition
@@ -0,0 +1,2 @@
+Fixes: [34594] Fix handling of WM_WINDOWPOS{CHANGING,CHANGED} for deactivated topmost window
+Depends: winex11-_NET_ACTIVE_WINDOW