[CLIENT] Mastery Editor Stuck Open [Steps to recreate inside]

Step 1.) Move your client window to the right until only the damage and defense mastery pages are visible. Step 2.) Open your mastery editor Step 3.) Congratulations, the window will no longer move and the 'X' is out of your monitor's range.

Rito pls let 'ESC' close the mastery editor, or add a 'CLOSE' button on the left. This happened during Team Builder in my experience. This is hindering to anyone who only has one monitor and uses mirror referencing to do their masteries.