make input roll scroll bars visible even when the whole input roll is not

Author: SuuperW

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

@@ -1742,7 +1742,6 @@ private void RecalculateScrollBars()
 					}
 				}
 
-				_vBar.Location = new Point(Width - _vBar.Width, 0);
 				_vBar.Height = Height;
 				_vBar.Visible = true;
 			}
@@ -1764,7 +1763,6 @@ private void RecalculateScrollBars()
 					_hBar.Maximum = TotalColWidth - _drawWidth + _hBar.LargeChange;
 				}
 
-				_hBar.Location = new Point(0, Height - _hBar.Height);
 				_hBar.Width = Width - (NeedsVScrollbar ? (_vBar.Width + 1) : 0);
 				_hBar.Visible = true;
 			}
@@ -1773,6 +1771,17 @@ private void RecalculateScrollBars()
 				_hBar.Visible = false;
 				_hBar.Value = 0;
 			}
+
+			RepositionScrollbars();
+		}
+
+		public void RepositionScrollbars()
+		{
+			int edge = Parent != null ? Math.Min(Width, Parent.Width - Left) : Width;
+			_vBar.Location = new Point(Math.Max(edge - _vBar.Width, 0), 0);
+
+			edge = Parent != null ? Math.Min(Height, Parent.Height - Top) : Height;
+			_hBar.Location = new Point(0, Math.Max(edge - _hBar.Height, 0));
 		}
 
 		private void UpdateDrawSize()

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

@@ -243,6 +243,7 @@ private void RepositionRolls()
 				int y = margin;
 				for (int i = 0; i < _inputRolls.Count; i++)
 				{
+					_inputRolls[i].SuspendDrawing();
 					_inputRolls[i].Top = y - _tasViewVBar.Value;
 					_inputRolls[i].Height = _inputRolls[i].TotalColWidth + 1 + _tasViewHBar.Height;
 
@@ -263,6 +264,8 @@ private void RepositionRolls()
 				{
 					roll.Width = _tasViewPanel.Width - (_tasViewVBar.Visible ? _tasViewVBar.Width : 0);
 					roll.Anchor = AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right;
+					roll.RepositionScrollbars();
+					roll.ResumeDrawing();
 					roll.Refresh();
 				}
 
@@ -279,6 +282,7 @@ private void RepositionRolls()
 				int x = margin;
 				for (int i = 0; i < _inputRolls.Count; i++)
 				{
+					_inputRolls[i].SuspendDrawing();
 					_inputRolls[i].Left = x - _tasViewHBar.Value;
 					_inputRolls[i].Width = _inputRolls[i].TotalColWidth + 1 + _tasViewVBar.Width;
 
@@ -299,6 +303,8 @@ private void RepositionRolls()
 				{
 					roll.Height = _tasViewPanel.Height - (_tasViewHBar.Visible ? _tasViewHBar.Height : 0);
 					roll.Anchor = AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom;
+					roll.RepositionScrollbars();
+					roll.ResumeDrawing();
 					roll.Refresh();
 				}