[Layout] Deselect object after removal

If the selected object is not in the composition, deselect it.

Add tests.

Fixes #1731

platform/features/layout/src/LayoutController.js

@@ -26,8 +26,12 @@
  * @namespace platform/features/layout
  */
 define(
-    ['./LayoutDrag'],
+    [
-    function (LayoutDrag) {
+        './LayoutDrag'
+    ],
+    function (
+        LayoutDrag
+    ) {
 
         var DEFAULT_DIMENSIONS = [12, 8],
             DEFAULT_GRID_SIZE = [32, 32],
@@ -124,6 +128,10 @@ define(
                             self.select(null, self.droppedIdToSelectAfterRefresh);
                             delete self.droppedIdToSelectAfterRefresh;
                         }
+
+                        if (composition.indexOf(self.selectedId) === -1) {
+                            self.clearSelection();
+                        }
                     }
                 });
             }

platform/features/layout/test/LayoutControllerSpec.js

@@ -424,6 +424,17 @@ define(
                 expect(selectedObj.showFrame).toEqual(jasmine.any(Function));
             });
 
+            it("deselects the object that is no longer in the composition", function () {
+                mockScope.$watchCollection.mostRecentCall.args[1]();
+                var childObj = mockCompositionObjects[0];
+                controller.select(mockEvent, childObj.getId());
+
+                var composition = ["b", "c"];
+                mockScope.$watchCollection.mostRecentCall.args[1](composition);
+
+                expect(controller.selected(childObj)).toBe(false);
+            });
+
         });
     }
 );