WPF - OnWindowStateChanged only call WasHidden(false) when previous state was Minimized

Store the previous window state and only call IBrowserHost.WasHidden(false) if the browser was
previous hidden. Call isn't required when transitioning between Normal and Maximized

Author: amaitland

CefSharp.Wpf/ChromiumWebBrowser.cs

@@ -43,7 +43,12 @@ public class ChromiumWebBrowser : Control, IRenderWebBrowser, IWpfWebBrowser
         /// View Rectangle used by <see cref="GetViewRect"/>
         /// </summary>
         private Rect viewRect;
-
+        /// <summary>
+        /// Store the previous window state, used to determine if the
+        /// Windows was previous <see cref="WindowState.Minimized"/>
+        /// and resume rendering
+        /// </summary>
+        private WindowState previousWindowState;
         /// <summary>
         /// The source
         /// </summary>
@@ -1756,12 +1761,15 @@ private void OnWindowStateChanged(object sender, EventArgs e)
                 case WindowState.Normal:
                 case WindowState.Maximized:
                 {
-                    if (browser != null)
+                    if (previousWindowState == WindowState.Minimized)
                     {
-                        browser.GetHost().WasHidden(false);
-                    }
+                        if (browser != null)
+                        {
+                            browser.GetHost().WasHidden(false);
+                        }
 
-                    ResizeHackFor2779();
+                        ResizeHackFor2779();
+                    }
 
                     break;
                 }
@@ -1779,6 +1787,8 @@ private void OnWindowStateChanged(object sender, EventArgs e)
                     break;
                 }
             }
+
+            previousWindowState = window.WindowState;
         }
 
         /// <summary>