From 8ca854251a89f45a90db8f60f607a477e7e8dbde Mon Sep 17 00:00:00 2001
From: Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
Date: Tue, 15 Jan 2019 13:45:28 +0900
Subject: [PATCH] [WIN32SS][NTUSER] Don't freeze Task Bar in switching the app
 (#1243)

This avoids taskbar hung up.
---
 win32ss/user/ntuser/simplecall.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/win32ss/user/ntuser/simplecall.c b/win32ss/user/ntuser/simplecall.c
index 67377de4a8c..7cd2c8490d9 100644
--- a/win32ss/user/ntuser/simplecall.c
+++ b/win32ss/user/ntuser/simplecall.c
@@ -515,6 +515,11 @@ NtUserCallTwoParam(
             {
                 break;
             }
+            if (MsqIsHung(Window->head.pti))
+            {
+                // TODO: Make the window ghosted and activate.
+                break;
+            }
             if (fAltTab)
             {
                 if (Window->style & WS_MINIMIZE)