address #3500

src/BizHawk.Client.EmuHawk/tools/TAStudio/PlaybackBox.cs

@@ -127,7 +127,7 @@ namespace BizHawk.Client.EmuHawk
 		private void RecordingModeCheckbox_MouseClick(object sender, MouseEventArgs e)
 		{
 			RecordingMode ^= true;
-			Tastudio.WasRecording = RecordingMode; // hard reset at manual click
+			Tastudio.WasRecording = RecordingMode; // hard reset at manual click and hotkey
 		}
 
 		private void RewindButton_MouseDown(object sender, MouseEventArgs e)

src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.IControlMainForm.cs

@@ -54,14 +54,7 @@ namespace BizHawk.Client.EmuHawk
 
 		public void ToggleReadOnly()
 		{
-			if (CurrentTasMovie.IsPlayingOrFinished())
-			{
-				TastudioRecordMode();
-			}
-			else if (CurrentTasMovie.IsRecording())
-			{
-				TastudioPlayMode();
-			}
+			TastudioToggleReadOnly();
 		}
 
 		public bool WantsToControlStopMovie { get; private set; }

src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs

@@ -712,6 +712,12 @@ namespace BizHawk.Client.EmuHawk
 			TasPlaybackBox.RecordingMode = false;
 		}
 
+		private void TastudioToggleReadOnly()
+		{
+			TasPlaybackBox.RecordingMode ^= true;
+			WasRecording = TasPlaybackBox.RecordingMode; // hard reset at manual click and hotkey
+		}
+
 		private void TastudioRecordMode()
 		{
 			TasPlaybackBox.RecordingMode = true;