Add column name tooltip to column headers in TAStudio

- closes #3124

src/BizHawk.Client.EmuHawk/CustomControls/InputRoll/InputRoll.cs

@@ -1604,7 +1604,7 @@ namespace BizHawk.Client.EmuHawk
 				PointedCellChanged(this, new CellEventArgs(_lastCell, CurrentCell));
 			}
 
-			if (CurrentCell?.Column != null && CurrentCell.RowIndex.HasValue)
+			if (CurrentCell?.Column is not null)
 			{
 				_hoverTimer.Start();
 			}

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

@@ -193,6 +193,7 @@ namespace BizHawk.Client.EmuHawk
 			this.BookMarkControl = new BizHawk.Client.EmuHawk.BookmarksBranchesBox();
 			this.BranchesMarkersSplit = new System.Windows.Forms.SplitContainer();
 			this.MainVertialSplit = new System.Windows.Forms.SplitContainer();
+			this.toolTip1 = new System.Windows.Forms.ToolTip(this.components);
 			this.TASMenu.SuspendLayout();
 			this.TasStatusStrip.SuspendLayout();
 			this.RightClickMenu.SuspendLayout();
@@ -1385,5 +1386,6 @@ namespace BizHawk.Client.EmuHawk
 		private BizHawk.WinForms.Controls.ToolStripMenuItemEx LoadBranchOnDoubleclickMenuItem;
 		private BizHawk.WinForms.Controls.ToolStripMenuItemEx SetFontMenuItem;
 		private BizHawk.WinForms.Controls.ToolStripMenuItemEx CopyIncludesFrameNoMenuItem;
+		private System.Windows.Forms.ToolTip toolTip1;
 	}
 }

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

@@ -936,6 +936,8 @@ namespace BizHawk.Client.EmuHawk
 
 		private void TasView_PointedCellChanged(object sender, InputRoll.CellEventArgs e)
 		{
+			toolTip1.SetToolTip(TasView, null);
+
 			if (e.NewCell.RowIndex is null)
 			{
 				return;

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

@@ -153,6 +153,13 @@ namespace BizHawk.Client.EmuHawk
 			BookMarkControl.SavedCallback = BranchSaved;
 			BookMarkControl.RemovedCallback = BranchRemoved;
 			TasView.MouseLeave += TAStudio_MouseLeave;
+			TasView.CellHovered += (_, e) =>
+			{
+				if (e.NewCell.RowIndex is null)
+				{
+					toolTip1.Show(e.NewCell.Column!.Name, TasView, PointToClient(Cursor.Position));
+				}
+			};
 		}
 
 		private void Tastudio_Load(object sender, EventArgs e)
@@ -1146,6 +1153,7 @@ namespace BizHawk.Client.EmuHawk
 
 		private void TAStudio_MouseLeave(object sender, EventArgs e)
 		{
+			toolTip1.SetToolTip(TasView, null);
 			DoTriggeredAutoRestoreIfNeeded();
 		}
 

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

@@ -126,4 +126,7 @@
   <metadata name="RightClickMenu.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>249, 17</value>
   </metadata>
+  <metadata name="toolTip1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>388, 17</value>
+  </metadata>
 </root>