Fixes #2026. Added ClearOnVisibleFalse to flag if the view must be cleared or not. (#2020)

* Fixes #1984. Added ClearOnVisibleFalse to flag if the view must be cleared or not.

* Fixes #2022. ScrollBarView doesn't show the down arrow on vertical if there isn't horizontal.

Terminal.Gui/Core/View.cs

@@ -1820,7 +1820,7 @@ namespace Terminal.Gui {
 		/// <param name="command"></param>
 		public void ClearKeybinding (params Command [] command)
 		{
-			foreach (var kvp in KeyBindings.Where (kvp => kvp.Value.SequenceEqual (command)).ToArray()) {
+			foreach (var kvp in KeyBindings.Where (kvp => kvp.Value.SequenceEqual (command)).ToArray ()) {
 				KeyBindings.Remove (kvp.Key);
 			}
 		}
@@ -2556,6 +2556,11 @@ namespace Terminal.Gui {
 			}
 		}
 
+		/// <summary>
+		/// Gets or sets whether a view is cleared if the <see cref="Visible"/> property is <see langword="false"/>.
+		/// </summary>
+		public bool ClearOnVisibleFalse { get; set; } = true;
+
 		/// <inheritdoc/>>
 		public override bool Visible {
 			get => base.Visible;
@@ -2566,7 +2571,9 @@ namespace Terminal.Gui {
 						if (HasFocus) {
 							SetHasFocus (false, this);
 						}
-						Clear ();
+						if (ClearOnVisibleFalse) {
+							Clear ();
+						}
 					}
 					OnVisibleChanged ();
 					SetNeedsDisplay ();

Terminal.Gui/Views/ScrollBarView.cs

@@ -106,7 +106,7 @@ namespace Terminal.Gui {
 				OtherScrollBarView.X = OtherScrollBarView.IsVertical ? Pos.Right (host) - 1 : Pos.Left (host);
 				OtherScrollBarView.Y = OtherScrollBarView.IsVertical ? Pos.Top (host) : Pos.Bottom (host) - 1;
 				OtherScrollBarView.Host.SuperView.Add (OtherScrollBarView);
-				OtherScrollBarView.showScrollIndicator = true;
+				OtherScrollBarView.ShowScrollIndicator = true;
 			}
 			ShowScrollIndicator = true;
 			contentBottomRightCorner = new View (" ") { Visible = host.Visible };
@@ -116,6 +116,7 @@ namespace Terminal.Gui {
 			contentBottomRightCorner.Width = 1;
 			contentBottomRightCorner.Height = 1;
 			contentBottomRightCorner.MouseClick += ContentBottomRightCorner_MouseClick;
+			ClearOnVisibleFalse = false;
 		}
 
 		private void Host_VisibleChanged ()
@@ -188,11 +189,9 @@ namespace Terminal.Gui {
 		public int Size {
 			get => size;
 			set {
-				if (hosted || (otherScrollBarView != null && otherScrollBarView.hosted)) {
-					size = value + 1;
-				} else {
-					size = value;
-				}
+				size = value;
+				SetRelativeLayout (Bounds);
+				ShowHideScrollBars (false);
 				SetNeedsDisplay ();
 			}
 		}
@@ -220,9 +219,6 @@ namespace Terminal.Gui {
 						position = Math.Max (position + max, 0);
 					}
 					var s = GetBarsize (vertical);
-					if (position + s == size && (hosted || (otherScrollBarView != null && otherScrollBarView.hosted))) {
-						position++;
-					}
 					OnChangedPosition ();
 					SetNeedsDisplay ();
 				}
@@ -327,11 +323,13 @@ namespace Terminal.Gui {
 			ShowHideScrollBars ();
 		}
 
-		void ShowHideScrollBars ()
+		void ShowHideScrollBars (bool redraw = true)
 		{
 			if (!hosted || (hosted && !autoHideScrollBars)) {
 				if (contentBottomRightCorner != null && contentBottomRightCorner.Visible) {
 					contentBottomRightCorner.Visible = false;
+				} else if (otherScrollBarView != null && otherScrollBarView.contentBottomRightCorner != null && otherScrollBarView.contentBottomRightCorner.Visible) {
+					otherScrollBarView.contentBottomRightCorner.Visible = false;
 				}
 				return;
 			}
@@ -350,24 +348,34 @@ namespace Terminal.Gui {
 			if (showBothScrollIndicator) {
 				if (contentBottomRightCorner != null) {
 					contentBottomRightCorner.Visible = true;
+				} else if (otherScrollBarView != null && otherScrollBarView.contentBottomRightCorner != null) {
+					otherScrollBarView.contentBottomRightCorner.Visible = true;
 				}
 			} else if (!showScrollIndicator) {
 				if (contentBottomRightCorner != null) {
 					contentBottomRightCorner.Visible = false;
+				} else if (otherScrollBarView != null && otherScrollBarView.contentBottomRightCorner != null) {
+					otherScrollBarView.contentBottomRightCorner.Visible = false;
 				}
 				if (Application.mouseGrabView != null && Application.mouseGrabView == this) {
 					Application.UngrabMouse ();
 				}
-			} else {
+			} else if (contentBottomRightCorner != null) {
 				contentBottomRightCorner.Visible = false;
+			} else if (otherScrollBarView != null && otherScrollBarView.contentBottomRightCorner != null) {
+				otherScrollBarView.contentBottomRightCorner.Visible = false;
 			}
 			if (Host?.Visible == true && showScrollIndicator && !Visible) {
 				Visible = true;
 			}
-			if (Host?.Visible == true && otherScrollBarView != null && otherScrollBarView.showScrollIndicator
-				&& !otherScrollBarView.Visible) {
+			if (Host?.Visible == true && otherScrollBarView?.showScrollIndicator == true && !otherScrollBarView.Visible) {
 				otherScrollBarView.Visible = true;
 			}
+
+			if (!redraw) {
+				return;
+			}
+
 			if (showScrollIndicator) {
 				Redraw (Bounds);
 			}
@@ -384,13 +392,22 @@ namespace Terminal.Gui {
 				if (scrollBarView.showScrollIndicator) {
 					scrollBarView.ShowScrollIndicator = false;
 				}
+				if (scrollBarView.Visible) {
+					scrollBarView.Visible = false;
+				}
 			} else if (barsize > 0 && barsize == scrollBarView.size && scrollBarView.OtherScrollBarView != null && pending) {
 				if (scrollBarView.showScrollIndicator) {
 					scrollBarView.ShowScrollIndicator = false;
 				}
+				if (scrollBarView.Visible) {
+					scrollBarView.Visible = false;
+				}
 				if (scrollBarView.OtherScrollBarView != null && scrollBarView.showBothScrollIndicator) {
 					scrollBarView.OtherScrollBarView.ShowScrollIndicator = false;
 				}
+				if (scrollBarView.OtherScrollBarView.Visible) {
+					scrollBarView.OtherScrollBarView.Visible = false;
+				}
 			} else if (barsize > 0 && barsize == size && scrollBarView.OtherScrollBarView != null && !pending) {
 				pending = true;
 			} else {
@@ -398,10 +415,16 @@ namespace Terminal.Gui {
 					if (!scrollBarView.showBothScrollIndicator) {
 						scrollBarView.OtherScrollBarView.ShowScrollIndicator = true;
 					}
+					if (!scrollBarView.OtherScrollBarView.Visible) {
+						scrollBarView.OtherScrollBarView.Visible = true;
+					}
 				}
 				if (!scrollBarView.showScrollIndicator) {
 					scrollBarView.ShowScrollIndicator = true;
 				}
+				if (!scrollBarView.Visible) {
+					scrollBarView.Visible = true;
+				}
 			}
 
 			return pending;
@@ -418,7 +441,7 @@ namespace Terminal.Gui {
 			} else if (showScrollIndicator) {
 				Width = vertical ? 1 : Dim.Width (Host) - 0;
 				Height = vertical ? Dim.Height (Host) - 0 : 1;
-			} else if (otherScrollBarView != null && otherScrollBarView.showScrollIndicator) {
+			} else if (otherScrollBarView?.showScrollIndicator == true) {
 				otherScrollBarView.Width = otherScrollBarView.vertical ? 1 : Dim.Width (Host) - 0;
 				otherScrollBarView.Height = otherScrollBarView.vertical ? Dim.Height (Host) - 0 : 1;
 			}
@@ -432,7 +455,10 @@ namespace Terminal.Gui {
 		///<inheritdoc/>
 		public override void Redraw (Rect region)
 		{
-			if (ColorScheme == null || Size == 0) {
+			if (ColorScheme == null || ((!showScrollIndicator || Size == 0) && AutoHideScrollBars && Visible)) {
+				if ((!showScrollIndicator || Size == 0) && AutoHideScrollBars && Visible) {
+					ShowHideScrollBars (false);
+				}
 				return;
 			}
 
@@ -578,6 +604,8 @@ namespace Terminal.Gui {
 
 			if (contentBottomRightCorner != null && hosted && showBothScrollIndicator) {
 				contentBottomRightCorner.Redraw (contentBottomRightCorner.Bounds);
+			} else if (otherScrollBarView != null && otherScrollBarView.contentBottomRightCorner != null && otherScrollBarView.hosted && otherScrollBarView.showBothScrollIndicator) {
+				otherScrollBarView.contentBottomRightCorner.Redraw (otherScrollBarView.contentBottomRightCorner.Bounds);
 			}
 		}
 

UnitTests/ScrollBarViewTests.cs

@@ -192,9 +192,9 @@ namespace Terminal.Gui.Views {
 			_hostView.Redraw (_hostView.Bounds);
 
 			Assert.Equal (_scrollBar.Position, _hostView.Top);
-			Assert.Equal (_scrollBar.Size, _hostView.Lines + 1);
+			Assert.Equal (_scrollBar.Size, _hostView.Lines);
 			Assert.Equal (_scrollBar.OtherScrollBarView.Position, _hostView.Left);
-			Assert.Equal (_scrollBar.OtherScrollBarView.Size, _hostView.Cols + 1);
+			Assert.Equal (_scrollBar.OtherScrollBarView.Size, _hostView.Cols);
 		}
 
 		[Fact]
@@ -310,8 +310,8 @@ namespace Terminal.Gui.Views {
 			Assert.Equal (25, _hostView.Bounds.Height);
 			Assert.Equal (79, _scrollBar.OtherScrollBarView.Bounds.Width);
 			Assert.Equal (24, _scrollBar.Bounds.Height);
-			Assert.Equal (31, _scrollBar.Size);
-			Assert.Equal (101, _scrollBar.OtherScrollBarView.Size);
+			Assert.Equal (30, _scrollBar.Size);
+			Assert.Equal (100, _scrollBar.OtherScrollBarView.Size);
 			Assert.True (_scrollBar.ShowScrollIndicator);
 			Assert.True (_scrollBar.OtherScrollBarView.ShowScrollIndicator);
 			Assert.True (_scrollBar.Visible);
@@ -320,8 +320,8 @@ namespace Terminal.Gui.Views {
 			_scrollBar.Position = 50;
 			Assert.Equal (_scrollBar.Position, _scrollBar.Size - _scrollBar.Bounds.Height);
 			Assert.Equal (_scrollBar.Position, _hostView.Top);
-			Assert.Equal (7, _scrollBar.Position);
-			Assert.Equal (7, _hostView.Top);
+			Assert.Equal (6, _scrollBar.Position);
+			Assert.Equal (6, _hostView.Top);
 			Assert.True (_scrollBar.ShowScrollIndicator);
 			Assert.True (_scrollBar.OtherScrollBarView.ShowScrollIndicator);
 			Assert.True (_scrollBar.Visible);
@@ -330,8 +330,8 @@ namespace Terminal.Gui.Views {
 			_scrollBar.OtherScrollBarView.Position = 150;
 			Assert.Equal (_scrollBar.OtherScrollBarView.Position, _scrollBar.OtherScrollBarView.Size - _scrollBar.OtherScrollBarView.Bounds.Width);
 			Assert.Equal (_scrollBar.OtherScrollBarView.Position, _hostView.Left);
-			Assert.Equal (22, _scrollBar.OtherScrollBarView.Position);
-			Assert.Equal (22, _hostView.Left);
+			Assert.Equal (21, _scrollBar.OtherScrollBarView.Position);
+			Assert.Equal (21, _hostView.Left);
 			Assert.True (_scrollBar.ShowScrollIndicator);
 			Assert.True (_scrollBar.OtherScrollBarView.ShowScrollIndicator);
 			Assert.True (_scrollBar.Visible);
@@ -350,14 +350,14 @@ namespace Terminal.Gui.Views {
 			_scrollBar.Position = 50;
 			Assert.Equal (_scrollBar.Position, _scrollBar.Size - 1);
 			Assert.Equal (_scrollBar.Position, _hostView.Top);
-			Assert.Equal (30, _scrollBar.Position);
-			Assert.Equal (30, _hostView.Top);
+			Assert.Equal (29, _scrollBar.Position);
+			Assert.Equal (29, _hostView.Top);
 
 			_scrollBar.OtherScrollBarView.Position = 150;
 			Assert.Equal (_scrollBar.OtherScrollBarView.Position, _scrollBar.OtherScrollBarView.Size - 1);
 			Assert.Equal (_scrollBar.OtherScrollBarView.Position, _hostView.Left);
-			Assert.Equal (100, _scrollBar.OtherScrollBarView.Position);
-			Assert.Equal (100, _hostView.Left);
+			Assert.Equal (99, _scrollBar.OtherScrollBarView.Position);
+			Assert.Equal (99, _hostView.Left);
 		}
 
 		[Fact]
@@ -497,7 +497,7 @@ namespace Terminal.Gui.Views {
 				};
 
 				listView.DrawContent += (e) => {
-					newScrollBarView.Size = listView.Source.Count - 1;
+					newScrollBarView.Size = listView.Source.Count;
 					Assert.Equal (newScrollBarView.Size, listView.Source.Count);
 					newScrollBarView.Position = listView.TopItem;
 					Assert.Equal (newScrollBarView.Position, listView.TopItem);
@@ -572,7 +572,7 @@ namespace Terminal.Gui.Views {
 				};
 
 				listView.DrawContent += (e) => {
-					newScrollBarView.Size = listView.Maxlength - 1;
+					newScrollBarView.Size = listView.Maxlength;
 					Assert.Equal (newScrollBarView.Size, listView.Maxlength);
 					newScrollBarView.Position = listView.LeftItem;
 					Assert.Equal (newScrollBarView.Position, listView.LeftItem);
@@ -618,9 +618,9 @@ namespace Terminal.Gui.Views {
 			Assert.Equal (0, max);
 			Assert.False (sbv.OtherScrollBarView.CanScroll (10, out max, sbv.OtherScrollBarView.IsVertical));
 			Assert.Equal (0, max);
-			// They are visible but are not drawn.
-			Assert.True (sbv.Visible);
-			Assert.True (sbv.OtherScrollBarView.Visible);
+			// They aren't visible so they aren't drawn.
+			Assert.False (sbv.Visible);
+			Assert.False (sbv.OtherScrollBarView.Visible);
 			top.LayoutSubviews ();
 			// Now the host bounds is not empty.
 			Assert.True (sbv.CanScroll (10, out max, sbv.IsVertical));
@@ -628,17 +628,19 @@ namespace Terminal.Gui.Views {
 			Assert.True (sbv.OtherScrollBarView.CanScroll (10, out max, sbv.OtherScrollBarView.IsVertical));
 			Assert.Equal (10, max);
 			Assert.True (sbv.CanScroll (50, out max, sbv.IsVertical));
-			Assert.Equal (17, max); // 17+23=40
+			Assert.Equal (40, sbv.Size);
+			Assert.Equal (15, max); // 15+25=40
 			Assert.True (sbv.OtherScrollBarView.CanScroll (150, out max, sbv.OtherScrollBarView.IsVertical));
-			Assert.Equal (22, max); // 22+78=100
-			Assert.True (sbv.Visible);
-			Assert.True (sbv.OtherScrollBarView.Visible);
+			Assert.Equal (100, sbv.OtherScrollBarView.Size);
+			Assert.Equal (20, max); // 20+80=100
+			Assert.False (sbv.Visible);
+			Assert.False (sbv.OtherScrollBarView.Visible);
 			sbv.KeepContentAlwaysInViewport = false;
 			sbv.OtherScrollBarView.KeepContentAlwaysInViewport = false;
 			Assert.True (sbv.CanScroll (50, out max, sbv.IsVertical));
-			Assert.Equal (40, max);
+			Assert.Equal (39, max);
 			Assert.True (sbv.OtherScrollBarView.CanScroll (150, out max, sbv.OtherScrollBarView.IsVertical));
-			Assert.Equal (100, max);
+			Assert.Equal (99, max);
 			Assert.True (sbv.Visible);
 			Assert.True (sbv.OtherScrollBarView.Visible);
 		}
@@ -801,5 +803,182 @@ namespace Terminal.Gui.Views {
 			pos = GraphViewTests.AssertDriverContentsWithFrameAre (expected, output);
 			Assert.Equal (new Rect (0, 0, 10, 10), pos);
 		}
+
+
+		[Fact, AutoInitShutdown]
+		public void ContentBottomRightCorner_Not_Redraw_If_Both_Size_Equal_To_Zero ()
+		{
+			var text = "This is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test";
+			var label = new Label (text);
+			Application.Top.Add (label);
+
+			var sbv = new ScrollBarView (label, true, true) {
+				Size = 100,
+			};
+			sbv.OtherScrollBarView.Size = 100;
+			Application.Begin (Application.Top);
+
+			Assert.Equal (100, sbv.Size);
+			Assert.Equal (100, sbv.OtherScrollBarView.Size);
+			Assert.True (sbv.ShowScrollIndicator);
+			Assert.True (sbv.OtherScrollBarView.ShowScrollIndicator);
+			Assert.True (sbv.Visible);
+			Assert.True (sbv.OtherScrollBarView.Visible);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a tes▲
+This is a tes┬
+This is a tes┴
+This is a tes░
+This is a tes▼
+◄├─┤░░░░░░░░► 
+", output);
+
+			sbv.Size = 0;
+			sbv.OtherScrollBarView.Size = 0;
+			Assert.Equal (0, sbv.Size);
+			Assert.Equal (0, sbv.OtherScrollBarView.Size);
+			Assert.False (sbv.ShowScrollIndicator);
+			Assert.False (sbv.OtherScrollBarView.ShowScrollIndicator);
+			Assert.False (sbv.Visible);
+			Assert.False (sbv.OtherScrollBarView.Visible);
+			Application.Top.Redraw (Application.Top.Bounds);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a test
+This is a test
+This is a test
+This is a test
+This is a test
+This is a test
+", output);
+
+			sbv.Size = 50;
+			sbv.OtherScrollBarView.Size = 50;
+			Assert.Equal (50, sbv.Size);
+			Assert.Equal (50, sbv.OtherScrollBarView.Size);
+			Assert.True (sbv.ShowScrollIndicator);
+			Assert.True (sbv.OtherScrollBarView.ShowScrollIndicator);
+			Assert.True (sbv.Visible);
+			Assert.True (sbv.OtherScrollBarView.Visible);
+			Application.Top.Redraw (Application.Top.Bounds);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a tes▲
+This is a tes┬
+This is a tes┴
+This is a tes░
+This is a tes▼
+◄├──┤░░░░░░░► 
+", output);
+
+		}
+
+		[Fact, AutoInitShutdown]
+		public void ContentBottomRightCorner_Not_Redraw_If_One_Size_Equal_To_Zero ()
+		{
+			var text = "This is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test";
+			var label = new Label (text);
+			Application.Top.Add (label);
+
+			var sbv = new ScrollBarView (label, true, false) {
+				Size = 100,
+			};
+			Application.Begin (Application.Top);
+
+			Assert.Equal (100, sbv.Size);
+			Assert.Null (sbv.OtherScrollBarView);
+			Assert.True (sbv.ShowScrollIndicator);
+			Assert.True (sbv.Visible);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a tes▲
+This is a tes┬
+This is a tes┴
+This is a tes░
+This is a tes░
+This is a tes▼
+", output);
+
+			sbv.Size = 0;
+			Assert.Equal (0, sbv.Size);
+			Assert.False (sbv.ShowScrollIndicator);
+			Assert.False (sbv.Visible);
+			Application.Top.Redraw (Application.Top.Bounds);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a test
+This is a test
+This is a test
+This is a test
+This is a test
+This is a test
+", output);
+		}
+
+		[Fact, AutoInitShutdown]
+		public void ShowScrollIndicator_False_Must_Also_Set_Visible_To_False_To_Not_Respond_To_Events ()
+		{
+			var clicked = false;
+			var text = "This is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test";
+			var label = new Label (text) { Width = 14, Height = 5 };
+			var btn = new Button (14, 0, "Click Me!");
+			btn.Clicked += () => clicked = true;
+			Application.Top.Add (label, btn);
+
+			var sbv = new ScrollBarView (label, true, false) {
+				Size = 5,
+			};
+			Application.Begin (Application.Top);
+
+			Assert.Equal (5, sbv.Size);
+			Assert.Null (sbv.OtherScrollBarView);
+			Assert.False (sbv.ShowScrollIndicator);
+			Assert.False (sbv.Visible);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a test[ Click Me! ]
+This is a test             
+This is a test             
+This is a test             
+This is a test             
+", output);
+
+			ReflectionTools.InvokePrivate (
+				typeof (Application),
+				"ProcessMouseEvent",
+				new MouseEvent () {
+					X = 15,
+					Y = 0,
+					Flags = MouseFlags.Button1Clicked
+				});
+
+			Assert.Null (Application.mouseGrabView);
+			Assert.True (clicked);
+
+			clicked = false;
+
+			sbv.Visible = true;
+			Assert.Equal (5, sbv.Size);
+			Assert.False (sbv.ShowScrollIndicator);
+			Assert.True (sbv.Visible);
+			Application.Top.Redraw (Application.Top.Bounds);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a test[ Click Me! ]
+This is a test             
+This is a test             
+This is a test             
+This is a test             
+", output);
+
+			ReflectionTools.InvokePrivate (
+				typeof (Application),
+				"ProcessMouseEvent",
+				new MouseEvent () {
+					X = 15,
+					Y = 0,
+					Flags = MouseFlags.Button1Clicked
+				});
+
+			Assert.Null (Application.mouseGrabView);
+			Assert.True (clicked);
+			Assert.Equal (5, sbv.Size);
+			Assert.False (sbv.ShowScrollIndicator);
+			Assert.False (sbv.Visible);
+		}
 	}
 }

UnitTests/ViewTests.cs

@@ -3830,6 +3830,66 @@ e
 │                            │
 │                            │
 └────────────────────────────┘
+", output);
+		}
+
+		[Fact, AutoInitShutdown]
+		public void ClearOnVisibleFalse_Gets_Sets ()
+		{
+			var text = "This is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test";
+			var label = new Label (text);
+			Application.Top.Add (label);
+
+			var sbv = new ScrollBarView (label, true, false) {
+				Size = 100,
+				ClearOnVisibleFalse = false
+			};
+			Application.Begin (Application.Top);
+
+			Assert.True (sbv.Visible);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a tes▲
+This is a tes┬
+This is a tes┴
+This is a tes░
+This is a tes░
+This is a tes▼
+", output);
+
+			sbv.Visible = false;
+			Assert.False (sbv.Visible);
+			Application.Top.Redraw (Application.Top.Bounds);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a test
+This is a test
+This is a test
+This is a test
+This is a test
+This is a test
+", output);
+
+			sbv.Visible = true;
+			Assert.True (sbv.Visible);
+			Application.Top.Redraw (Application.Top.Bounds);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a tes▲
+This is a tes┬
+This is a tes┴
+This is a tes░
+This is a tes░
+This is a tes▼
+", output);
+
+			sbv.ClearOnVisibleFalse = true;
+			sbv.Visible = false;
+			Assert.False (sbv.Visible);
+			GraphViewTests.AssertDriverContentsWithFrameAre (@"
+This is a tes
+This is a tes
+This is a tes
+This is a tes
+This is a tes
+This is a tes
 ", output);
 		}
 	}