remove designer null check hacks in favor of the intended DesignMode flag

BizHawk.Client.EmuHawk/config/N64/N64ControllerSettingControl.cs

@@ -34,29 +34,16 @@ namespace BizHawk.Client.EmuHawk
 			set
 			{
 				EnabledCheckbox.Checked = value;
-				if (PakTypeDropdown != null) // Null check for designer
-				{
 				PakTypeDropdown.Enabled = value;
-				}
-
 				Refresh();
 			}
 		}
 
 		public N64SyncSettings.N64ControllerSettings.N64ControllerPakType PakType
 		{
-			get
+			get => PakTypeDropdown.SelectedItem
-			{
-				if (PakTypeDropdown.SelectedItem != null) // Null check for designer
-				{
-					return PakTypeDropdown.SelectedItem
 				.ToString()
 				.GetEnumFromDescription<N64SyncSettings.N64ControllerSettings.N64ControllerPakType>();
-				}
-
-				return N64SyncSettings.N64ControllerSettings.N64ControllerPakType.NO_PAK;
-			}
-
 			set
 			{
 				if (PakTypeDropdown.Items.Count > 0) // Null check for designer

BizHawk.Client.EmuHawk/config/N64/N64ControllersSetup.cs

@@ -28,6 +28,11 @@ namespace BizHawk.Client.EmuHawk
 
 		private void N64ControllersSetup_Load(object sender, EventArgs e)
 		{
+			if (DesignMode)
+			{
+				return;
+			}
+
 			ControllerSettingControls
 				.ForEach(c =>
 				{

BizHawk.Client.EmuHawk/tools/Cheats/CheatEdit.cs

@@ -37,8 +37,11 @@ namespace BizHawk.Client.EmuHawk
 
 		public void Restart()
 		{
-			if (MemoryDomains != null) // the designer needs this check
+			if (DesignMode)
 			{
+				return;
+			}
+
 			DomainDropDown.Items.Clear();
 			DomainDropDown.Items.AddRange(MemoryDomains
 				.Where(d => d.Writable)
@@ -48,7 +51,6 @@ namespace BizHawk.Client.EmuHawk
 			DomainDropDown.SelectedItem = MemoryDomains.HasSystemBus
 				? MemoryDomains.SystemBus.ToString()
 				: MemoryDomains.MainMemory.ToString();
-			}
 
 			SetFormToDefault();
 		}

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

@@ -66,14 +66,15 @@ namespace BizHawk.Client.EmuHawk
 		protected override void OnLoad(EventArgs e)
 		{
 			base.OnLoad(e);
-
+			if (DesignMode)
-			if (Tastudio != null) // For the designer
 			{
+				return;
+			}
+
 			TurboSeekCheckbox.Checked = Tastudio.Config?.TurboSeek ?? false;
 			AutoRestoreCheckbox.Checked = Tastudio.Settings.AutoRestoreLastPosition;
 			FollowCursorCheckbox.Checked = Tastudio.Settings.FollowCursor;
 			RecordingModeCheckbox.Checked = RecordingMode;
-			}
 
 			_loading = false;
 		}