Errors on going fullscreen

[rudrakpatra]

my OS: Ubuntu 20.04.4 LTS

how to recreate the problem. in the WebGui demo press F11 , go to fullscreen the following problems occur

the drawing area is not updated.

Also, the postion of the mouse is vertically offset by a constant amount. the is highlighted and is clickable but the cursor actually shows up about 150px upwards (above layout and scrolling)

Also reloading the page when in fullscreen mode ...incorrectly sets the drawing area.