WPF - Fix OnMouseLeave in ChromiumWebBrowserWithMouseCapture

- Only send a mouse move on leave
- Update SimpleMainWindow.xaml to use ChromiumWebBrowserWithMouseCapture for testing purposes

Author: amaitland

CefSharp.Wpf.Example/SimpleMainWindow.xaml

@@ -1,14 +1,15 @@
-<Window x:Class="CefSharp.Wpf.Example.SimpleMainWindow"
+<Window x:Class="CefSharp.Wpf.Example.SimpleMainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:wpf="clr-namespace:CefSharp.Wpf;assembly=CefSharp.Wpf"
+        xmlns:experimental="clr-namespace:CefSharp.Wpf.Experimental;assembly=CefSharp.Wpf"
         Title="SimpleMainWindow" WindowState="Maximized">
     <Grid>
         <Grid.RowDefinitions>
             <RowDefinition />
             <RowDefinition Height="Auto" />
         </Grid.RowDefinitions>
-        <wpf:ChromiumWebBrowser Grid.Row="0"
+        <experimental:ChromiumWebBrowserWithMouseCapture Grid.Row="0"
                           x:Name="Browser"
                           Address="http://www.google.com" />
         <StatusBar Grid.Row="1">

CefSharp.Wpf/Experimental/ChromiumWebBrowserWithMouseCapture.cs

@@ -4,6 +4,8 @@
 
 using System;
 using System.Windows.Input;
+using CefSharp.Internals;
+using CefSharp.Wpf.Internals;
 
 namespace CefSharp.Wpf.Experimental
 {
@@ -46,5 +48,21 @@ protected override void OnMouseUp(MouseButtonEventArgs e)
             }
         }
 
+        protected override void OnMouseLeave(MouseEventArgs e)
+        {
+            if (!e.Handled && !IsDisposed)
+            {
+                var modifiers = e.GetModifiers();
+                var point = e.GetPosition(this);
+
+                var host = this.GetBrowserHost();
+                if (host != null && !host.IsDisposed)
+                {
+                    host.SendMouseMoveEvent((int)point.X, (int)point.Y, true, modifiers);
+                }
+
+                ((IWebBrowserInternal)this).SetTooltipText(null);
+            }
+        }
     }
 }