GTK Window Cover Entire Screen

Question

I\'m working on a small educational piece of work, I create a window and its supposed to cover the entire monitor. However \"special\" areas are not being covered as seen in

Answer 1

Panels are usually implemented with struts, and window managers can decide never to allow windows to cover them; that's one of the reasons why the whole idea of "full screen window" was introduced: it gives the window manager a hint that the window that requested to be full screen should cover all other windows; have no decorations; and also cover all eventual "system" components, like panels.