From 6e1a56ea4ca8933108e96cddf96f529e8f0955ab Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Fri, 25 Mar 2016 19:27:03 +0100
Subject: [PATCH] Don't display tooltip for hidden control.

If a control was hidden or removed between the time that the tooltip
timer starts and the popup is shown, don't display the tooltip. Fixes
#465.
---
 src/Perspex.Controls/ToolTip.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Perspex.Controls/ToolTip.cs b/src/Perspex.Controls/ToolTip.cs
index 319a24f50b..6fd71a21b5 100644
--- a/src/Perspex.Controls/ToolTip.cs
+++ b/src/Perspex.Controls/ToolTip.cs
@@ -7,6 +7,7 @@ using System.Reactive.Subjects;
 using Perspex.Controls.Primitives;
 using Perspex.Input;
 using Perspex.Threading;
+using Perspex.VisualTree;
 
 namespace Perspex.Controls
 {
@@ -102,7 +103,7 @@ namespace Perspex.Controls
         /// <param name="control">The control.</param>
         private static void ShowToolTip(Control control)
         {
-            if (control != null)
+            if (control != null && control.IsVisible && control.GetVisualRoot() != null)
             {
                 if (s_popup == null)
                 {