Unify appmenu behavior - enabled by default, in not-gnome desktop environments

[Bastián Díaz <diaz bastian openmailbox org>]

Hi, this is a subject that wanted to propose due to the latest updates 
of appmenu behavior on gnome 3.18.1.

As user choice, or in gnome-classic-session can disable appmenu top 
panel with gnome-tweak-tool, it helps to include a version of the menu 
within the application window, Unfortunately, each application - 
apparently - has its own implementation. For example compare gedit, 
gnome-documents and file-roller.

In some cases it may be due to lack of proper implementation and this 
affects the use of gnome applications on  not-gnome desktop environment.

Is it possible for developers to determine a 
standard/recommendation/implementation to achieve consistency in the 
behavior of appmenu (inside the application window)?

Is it possible that the appmenu inside the window is activated 
automatically in not-gnome desktop environments (xfce, kde, etc).?

Cheers

--
Bastián Díaz