Continued porting to react

src/app/utils/UtilityFunctions.js

@@ -14,6 +14,17 @@ export function wrapCtxMenu(cb) {
   };
 }
 
+/**
+ * Stop context menu / right-click propagation unless shift is held.
+ * @param  {SyntheticEvent} event Event
+ */
+export function stopCtxPropagation(event) {
+  if (!event.getModifierState('Shift')) {
+    event.preventDefault();
+    event.stopPropagation();
+  }
+}
+
 /**
  * Compares A and B and return true using strict comparison (===)
  * @param  {any} objA   A