=== Test Context Menu Off-screen support ===
 1. Open context menu by the right most table cell of right editor content;
  * Expected Result: Menu is fully visible.
 1. Mouse over to open the sub menu;
  * Expected Result: Sub menu is fully visible.
 1. Open context menu by the left most table cell of left editor content;
  * Expected Result: Menu is fully visible.
 1. Mouse over to open the sub menu;
  * Expected Result: Sub menu is fully visible.