provide Editor-specific SelectAll (placeholder until we can figure out how to do it by Selections)

Libraries/UniversalEditor.UserInterface/Editor.cs

@@ -912,5 +912,13 @@ namespace UniversalEditor.UserInterface
 		{
 			get { return GetDocumentPropertiesSettingsProviders().Length > 0; }
 		}
+
+		public virtual void SelectAll()
+		{
+			/*
+			Selection[] sel = editor.GetAvailableSelections();
+			editor.Selections.AddRange(sel);
+			*/
+		}
 	}
 }

Libraries/UniversalEditor.UserInterface/EditorApplication.cs

@@ -883,6 +883,12 @@ namespace UniversalEditor.UserInterface
 					}
 				}
 			});
+			Application.Instance.AttachCommandEventHandler("EditSelectAll", delegate (object sender, EventArgs e)
+			{
+				Editor editor = LastWindow.GetCurrentEditor();
+				if (editor == null) return;
+				editor.SelectAll();
+			});
 			Application.Instance.AttachCommandEventHandler("EditBatchFindReplace", delegate (object sender, EventArgs e)
 			{
 				if (LastWindow == null) return;