Fixes #3665: add is_fullscreen() method to Window class
Fixes #3665: add is_fullscreen() method to Window class

Signed-off-by: Diego Naula <ee2f532e1bd13c9a4890667f9647aa4eff9da071@gmail.com>

i5o/sugar-toolkit-gtk3,i5o/sugar-toolkit-gtk3,Daksh/sugar-toolkit-gtk3,godiard/sugar-toolkit-gtk3,tchx84/sugar-toolkit-gtk3,puneetgkaur/sugar-toolkit-gtk3,godiard/sugar-toolkit-gtk3,manuq/sugar-toolkit-gtk3,tchx84/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,Daksh/sugar-toolkit-gtk3,puneetgkaur/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,samdroid-apps/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,puneetgkaur/backup_sugar_sugartoolkit,godiard/sugar-toolkit-gtk3,i5o/sugar-toolkit-gtk3,i5o/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,puneetgkaur/backup_sugar_sugartoolkit,samdroid-apps/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,puneetgkaur/backup_sugar_sugartoolkit,puneetgkaur/sugar-toolkit-gtk3,manuq/sugar-toolkit-gtk3,tchx84/debian-pkg-sugar-toolkit-gtk3,tchx84/debian-pkg-sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,tchx84/sugar-toolkit-gtk3,manuq/sugar-toolkit-gtk3,Daksh/sugar-toolkit-gtk3,tchx84/debian-pkg-sugar-toolkit-gtk3,samdroid-apps/sugar-toolkit-gtk3,samdroid-apps/sugar-toolkit-gtk3