[release/7.0] [wasm][debugger] Never send messages from our internal protocol extensions to the browser (#77619)

* ignore messages from protocol extensions even for unknown context

* Addressing @radical comments

* adressing @radical comments

* adressing @radical comments

Co-authored-by: Thays Grazia <thaystg@gmail.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs b/src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs
index b34437b7238..0d5f948259c 100644
--- a/src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs
+++ b/src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs
@@ -283,7 +283,8 @@ namespace Microsoft.WebAssembly.Diagnostics
                     if (pauseOnException != PauseOnExceptionsKind.Unset)
                         _defaultPauseOnExceptions = pauseOnException;
                 }
-                return false;
+                // for Dotnetdebugger.* messages, treat them as handled, thus not passing them on to the browser
+                return method.StartsWith("DotnetDebugger.", StringComparison.OrdinalIgnoreCase);
             }
 
             switch (method)
@@ -582,8 +583,8 @@ namespace Microsoft.WebAssembly.Diagnostics
                         }
                     }
             }
-
-            return false;
+            // for Dotnetdebugger.* messages, treat them as handled, thus not passing them on to the browser
+            return method.StartsWith("DotnetDebugger.", StringComparison.OrdinalIgnoreCase);
         }
 
         private async Task<bool> ApplyUpdates(MessageId id, JObject args, CancellationToken token)