Freeze all other threads during evaluation.

src/AddIns/Debugger/Debugger.Core/Eval.cs

@@ -134,7 +134,7 @@ namespace Debugger
 			
 			appDomain.Process.activeEvals.Add(this);
 			
-			appDomain.Process.AsyncContinue(DebuggeeStateAction.Keep);
+			appDomain.Process.AsyncContinue(DebuggeeStateAction.Keep, evalThread);
 		}
 
 		/// <exception cref="DebuggerException">Evaluation can not be stopped</exception>

src/AddIns/Debugger/Debugger.Core/ManagedCallback.cs

@@ -98,6 +98,7 @@ namespace Debugger
 				process.AsyncContinue(DebuggeeStateAction.Keep);
 			} else if (process.Evaluating) {
 				// Ignore events during property evaluation
+				pausedEventArgs = null;
 				process.AsyncContinue(DebuggeeStateAction.Keep);
 			} else if (pauseOnNextExit) {
 				// process.TraceMessage("Callback exit: Paused");

src/AddIns/Debugger/Debugger.Core/Process.cs

@@ -459,12 +459,18 @@ namespace Debugger
 			AsyncContinue(DebuggeeStateAction.Clear);
 		}
 		
-		/// <param name="threadsToRun"> Null to keep current setting </param>
-		/// <param name="newThreadState"> What happens to created threads.  Null to keep current setting </param>
-		internal void AsyncContinue(DebuggeeStateAction action)
+		/// <param name="threadToRun"> Run this thread and freeze all other threads </param>
+		internal void AsyncContinue(DebuggeeStateAction action, Thread threadToRun = null)
 		{
 			AssertPaused();
 			
+			if (threadToRun != null) {
+				corProcess.SetAllThreadsDebugState(CorDebugThreadState.THREAD_SUSPEND, null);
+				threadToRun.CorThread.SetDebugState(CorDebugThreadState.THREAD_RUN);
+			} else {
+				corProcess.SetAllThreadsDebugState(CorDebugThreadState.THREAD_RUN, null);
+			}
+			
 			NotifyResumed(action);
 			corProcess.Continue(0);
 			// this.TraceMessage("Continue");