Revert "Incremental work on selectable elements."

This reverts commit 54c53b7a12.

Conflicts:
	src/Orchard.Web/Modules/Orchard.Layouts/Assets/JavaScript/Models/Canvas.js
	src/Orchard.Web/Modules/Orchard.Layouts/Scripts/Models.js
	src/Orchard.Web/Modules/Orchard.Layouts/Scripts/Models.min.js

src/Orchard.Web/Modules/Orchard.Layouts/Assets/JavaScript/Models/Canvas.js

@@ -12,10 +12,6 @@
             result.children = this.childrenToObject();
             return result;
         };
-
-        this.allowSealedFocus = function() {
-            return this.children.length === 0;
-        }
     };
 
     LayoutEditor.Canvas.from = function (value) {

src/Orchard.Web/Modules/Orchard.Layouts/Assets/JavaScript/Models/Column.js

@@ -3,6 +3,7 @@
     LayoutEditor.Column = function (data, htmlId, htmlClass, htmlStyle, isTemplated, width, offset, collapsible, rule, children) {
         LayoutEditor.Element.call(this, "Column", data, htmlId, htmlClass, htmlStyle, isTemplated, rule);
         LayoutEditor.Container.call(this, ["Grid", "Content"], children);
+        this.isTemplatedContainer = true;
         this.width = width;
         this.offset = offset;
         this.collapsible = collapsible;
@@ -11,10 +12,6 @@
         var _origWidth = 0;
         var _origOffset = 0;
 
-        this.allowSealedFocus = function () {
-            return this.children.length === 0;
-        }
-
         this.beginChange = function () {
             if (!!_hasPendingChange)
                 throw new Error("Column already has a pending change.");

src/Orchard.Web/Modules/Orchard.Layouts/Assets/JavaScript/Models/Element.js

@@ -72,14 +72,10 @@
             return this.editor.focusedElement === this;
         };
 
-        this.allowSealedFocus = function() {
-            return false;
-        };
-
         this.setIsFocused = function () {
             if (!this.editor)
                 return;
-            if (this.isTemplated && !this.allowSealedFocus())
+            if (this.isTemplated && this.isTemplatedContainer != true)
                 return;
             if (this.editor.isDragging || this.editor.inlineEditingIsActive || this.editor.isResizing)
                 return;