From 7d713682ba0c4c0dd8699b5727bf3b281fda2c04 Mon Sep 17 00:00:00 2001
From: Paddy Xu <xupaddy@gmail.com>
Date: Sat, 27 May 2017 00:41:10 +0300
Subject: [PATCH] the plug-in might be disposed before COM finishes when
 pressing SPACE key tooooo fast

---
 .../PreviewHandlerHost.cs                                  | 3 +++
 .../QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml.cs | 7 +++----
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewHandlerHost.cs b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewHandlerHost.cs
index e77a770..09d9f4c 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewHandlerHost.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewHandlerHost.cs
@@ -127,6 +127,9 @@ namespace QuickLook.Plugin.IPreviewHandlers
             if (_mCurrentPreviewHandler == null)
                 return false;
 
+            if (IsDisposed)
+                return false;
+
             // bind the preview handler to the control's bounds and preview the content
             var r = ClientRectangle;
             _mCurrentPreviewHandler.SetWindow(Handle, ref r);
diff --git a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml.cs
index 48fbdc2..640d101 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Windows.Controls;
-using System.Windows.Interop;
 using System.Windows.Threading;
 
 namespace QuickLook.Plugin.IPreviewHandlers
@@ -37,10 +36,10 @@ namespace QuickLook.Plugin.IPreviewHandlers
                 _control = new PreviewHandlerHost();
                 presenter.Child = _control;
                 _control.Open(file);
-            }), DispatcherPriority.Render);
+            }), DispatcherPriority.Loaded);
 
-            SetForegroundWindow(new WindowInteropHelper(context.ViewerWindow).Handle);
-            SetActiveWindow(presenter.Handle);
+            //SetForegroundWindow(new WindowInteropHelper(context.ViewerWindow).Handle);
+            //SetActiveWindow(presenter.Handle);
         }
 
         [DllImport("user32.dll")]