Fixes #2465 - Simplify/Enforce LayoutStyle.Absolute when X, Y, Width, and/or Height are null or Absolute() (#2467)

* Merged v2_develop; updated API docs

* Code cleanup

* Fixed code that was using Dim/Pos before IsInit

* Fixed ComboBox using Bounds before IsInitalized and grabbing focus when it shouldn't

* Fixed ComboBox tests. Fixed FileDialog

* Fixed all !IsInitalized warnings

* Fixed AllviewsTester

* Fixed CharMap scenario

* Fixed ColorPicker (hack)

* Fixed CoputedLayout and Csv Editor

* Imrpoved warning

* Fixed more warnings

* Fixed GetTextFormatterSizeNeededForTextAndHotKey

* Fixed AllViewsTester

* AllViewsTester code cleanup

* AllViewsTester code cleanup

* AllViewsTester fixed for realz

* Decided Fill was better than Percent for default

Author: tig

Terminal.Gui/View/Layout/ViewLayout.cs

@@ -82,14 +82,15 @@ public virtual void Add (View view)
 				view._oldEnabled = true;
 				view.Enabled = false;
 			}
-			SetNeedsLayout ();
-			SetNeedsDisplay ();
 
 			OnAdded (new SuperViewChangedEventArgs (this, view));
 			if (IsInitialized && !view.IsInitialized) {
 				view.BeginInit ();
 				view.EndInit ();
 			}
+
+			SetNeedsLayout ();
+			SetNeedsDisplay ();
 		}
 
 		/// <summary>