Magnifier is broken after changing screen resolution / scaling

As you can see in the screenshot below.

1. Open g-c-c and change the display resolution / scaling
2. Start magnifier, could be buggy in two ways:

• The magnifier doesn't occupy the whole screen (increasing the resolution or lowering the scaling value)
• It's not possible move the mouse at the far right of the screen (lowering the resolution or increasing the scaling value)