TAStudio: Update self after loading a state. There doesn't seem to be any reason to not update TAStudio, and doing so fixes two bugs that were most evident when loading the state for frame 0:

-The UI was not updated.
-TasSession.UpdateValues was not called.  So saving the movie and then re-loading it would result in the previous frame being loaded/seeked to.

Author: SuuperW

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

@@ -19,7 +19,6 @@ public partial class TAStudio : IToolForm
 		[OptionalService]
 		public ISaveRam SaveRamEmulator { get; private set; }
 
-		private bool _hackyDontUpdate;
 		private bool _initializing; // If true, will bypass restart logic, this is necessary since loading projects causes a movie to load which causes a rom to reload causing dialogs to restart
 
 		private int _lastRefresh;
@@ -67,11 +66,6 @@ protected override void UpdateAfter()
 				return;
 			}
 
-			if (_hackyDontUpdate)
-			{
-				return;
-			}
-
 			if (_exiting)
 			{
 				return;

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

@@ -961,18 +961,16 @@ public void LoadState(KeyValuePair<int, Stream> state)
 				Emulator.ResetCounters();
 			}
 
-			UpdateOtherTools();
+			UpdateTools();
 		}
 
 		public void AddBranchExternal() => BookMarkControl.AddBranchExternal();
 		public void RemoveBranchExternal() => BookMarkControl.RemoveBranchExternal();
 
-		private void UpdateOtherTools() // a hack probably, surely there is a better way to do this
+		private void UpdateTools()
 		{
-			_hackyDontUpdate = true;
 			Tools.UpdateToolsBefore();
 			Tools.UpdateToolsAfter();
-			_hackyDontUpdate = false;
 		}
 
 		public void TogglePause()