WPF/WinForms/OffScreen - CanExecuteJavascriptInMainFrame incorrectly false after loading page with different origin

Proof of concept for a workaround. The frameId for the second OnContextReleased that arrives after the OnContextCreated from
the old render process strangely has a frameId greater than the new frameId

TODO: Unit tests

Issue #3021

Author: amaitland

CefSharp.Core/Internals/ClientAdapter.cpp

@@ -1048,7 +1048,7 @@ namespace CefSharp
                 {
                     if (frame->IsMain())
                     {
-                        _browserControl->SetCanExecuteJavascriptOnMainFrame(true);
+                        _browserControl->SetCanExecuteJavascriptOnMainFrame(frame->GetIdentifier(), true);
                     }
 
                     auto handler = _browserControl->RenderProcessMessageHandler;
@@ -1072,7 +1072,7 @@ namespace CefSharp
                 {
                     if (frame->IsMain())
                     {
-                        _browserControl->SetCanExecuteJavascriptOnMainFrame(false);
+                        _browserControl->SetCanExecuteJavascriptOnMainFrame(frame->GetIdentifier(), false);
                     }
 
                     auto handler = _browserControl->RenderProcessMessageHandler;

CefSharp.OffScreen/ChromiumWebBrowser.cs

@@ -50,6 +50,11 @@ public class ChromiumWebBrowser : IRenderWebBrowser
         /// </summary>
         private int disposeSignaled;
 
+        /// <summary>
+        /// Used as workaround for issue https://github.com/cefsharp/CefSharp/issues/3021
+        /// </summary>
+        private long canExecuteJavascriptInMainFrameId;
+
         /// <summary>
         /// Gets a value indicating whether this instance is disposed.
         /// </summary>
@@ -906,8 +911,21 @@ void IWebBrowserInternal.SetTooltipText(string tooltipText)
             TooltipText = tooltipText;
         }
 
-        void IWebBrowserInternal.SetCanExecuteJavascriptOnMainFrame(bool canExecute)
+        void IWebBrowserInternal.SetCanExecuteJavascriptOnMainFrame(long frameId, bool canExecute)
         {
+            //When loading pages of a different origin the frameId changes
+            //For the first loading of a new origin the messages from the render process
+            //Arrive in a different order than expected, the OnContextCreated message
+            //arrives before the OnContextReleased, then the message for OnContextReleased
+            //incorrectly overrides the value
+            //https://github.com/cefsharp/CefSharp/issues/3021
+
+            if (frameId > canExecuteJavascriptInMainFrameId && !canExecute)
+            {
+                return;
+            }
+
+            canExecuteJavascriptInMainFrameId = frameId;
             CanExecuteJavascriptInMainFrame = canExecute;
         }
 

CefSharp.WinForms/ChromiumWebBrowser.cs

@@ -87,6 +87,11 @@ public class ChromiumWebBrowser : Control, IWebBrowserInternal, IWinFormsWebBrow
         /// </summary>
         private Control parkingControl;
 
+        /// <summary>
+        /// Used as workaround for issue https://github.com/cefsharp/CefSharp/issues/3021
+        /// </summary>
+        private long canExecuteJavascriptInMainFrameId;
+
         /// <summary>
         /// Gets a value indicating whether this instance is disposed.
         /// </summary>
@@ -909,8 +914,21 @@ void IWebBrowserInternal.OnLoadError(LoadErrorEventArgs args)
             }
         }
 
-        void IWebBrowserInternal.SetCanExecuteJavascriptOnMainFrame(bool canExecute)
+        void IWebBrowserInternal.SetCanExecuteJavascriptOnMainFrame(long frameId, bool canExecute)
         {
+            //When loading pages of a different origin the frameId changes
+            //For the first loading of a new origin the messages from the render process
+            //Arrive in a different order than expected, the OnContextCreated message
+            //arrives before the OnContextReleased, then the message for OnContextReleased
+            //incorrectly overrides the value
+            //https://github.com/cefsharp/CefSharp/issues/3021
+
+            if (frameId > canExecuteJavascriptInMainFrameId && !canExecute)
+            {
+                return;
+            }
+
+            canExecuteJavascriptInMainFrameId = frameId;
             CanExecuteJavascriptInMainFrame = canExecute;
         }
 

CefSharp.Wpf/ChromiumWebBrowser.cs

@@ -146,6 +146,11 @@ public class ChromiumWebBrowser : Control, IRenderWebBrowser, IWpfWebBrowser
         /// </summary>
         private int disposeSignaled;
 
+        /// <summary>
+        /// Used as workaround for issue https://github.com/cefsharp/CefSharp/issues/3021
+        /// </summary>
+        private long canExecuteJavascriptInMainFrameId;
+
         /// <summary>
         /// Gets a value indicating whether this instance is disposed.
         /// </summary>
@@ -1251,8 +1256,21 @@ void IWebBrowserInternal.OnLoadError(LoadErrorEventArgs args)
             LoadError?.Invoke(this, args);
         }
 
-        void IWebBrowserInternal.SetCanExecuteJavascriptOnMainFrame(bool canExecute)
+        void IWebBrowserInternal.SetCanExecuteJavascriptOnMainFrame(long frameId, bool canExecute)
         {
+            //When loading pages of a different origin the frameId changes
+            //For the first loading of a new origin the messages from the render process
+            //Arrive in a different order than expected, the OnContextCreated message
+            //arrives before the OnContextReleased, then the message for OnContextReleased
+            //incorrectly overrides the value
+            //https://github.com/cefsharp/CefSharp/issues/3021
+
+            if (frameId > canExecuteJavascriptInMainFrameId && !canExecute)
+            {
+                return;
+            }
+
+            canExecuteJavascriptInMainFrameId = frameId;
             CanExecuteJavascriptInMainFrame = canExecute;
         }
 

CefSharp/Internals/IWebBrowserInternal.cs

@@ -16,7 +16,7 @@ public interface IWebBrowserInternal : IWebBrowser
         void SetLoadingStateChange(LoadingStateChangedEventArgs args);
         void SetTitle(TitleChangedEventArgs args);
         void SetTooltipText(string tooltipText);
-        void SetCanExecuteJavascriptOnMainFrame(bool canExecute);
+        void SetCanExecuteJavascriptOnMainFrame(long frameId, bool canExecute);
         void SetJavascriptMessageReceived(JavascriptMessageReceivedEventArgs args);
 
         void OnFrameLoadStart(FrameLoadStartEventArgs args);