bug#24090: 25.1; toggle-frame-fullscreen breaks UI features in Gnome

[martin rudalics]

> With RC1 (from the tarball), when I have an Emacs frame in the
> "fullscreen" state (using M-x toggle-frame-fullscreen RET) (i.e. the
> frame fills my monitor and the title bar is hidden), two user interface
> features in Gnome are broken. The two features are:
>
> 1) Normally, when I move my mouse cursor to the top of my display, the
> Gnome top bar, which I keep hidden, drops down into view (in front of
> all other windows).
>
> 2) Normally, when I move the mouse cursor to the top left corner of my
> display (the "hot corner") a gallery of all my windows is shown and
> various user interface features are provided for controlling the desktop
> environment. (This "feature" is very annoying but I've never got around
> to turning it off.)
>
> The bug is that with an Emacs frame in the "fullscreen" state, nothing
> in particular happens when I move my mouse cursor to the top of the
> screen or to the top left corner.

FWIW Gnome's top bar and your gallery of windows should be of type
_NET_WM_TYPE_DOCK and are therefore shown _below_ your Emacs 'fullboth'
frame which should be of type _NET_WM_STATE_FULLSCREEN.  So I don't see
a bug here.

> This happens when the "fullscreen" Emacs frame is the active window in
> Gnome, and also when a window of another application is the active
> window if the window of the other application is not maximised. But if a
> window of another application is active and maximised (i.e. is in front
> of and hides the Emacs "fullscreen" frame), then the Gnome UI features
> work as usual.

Do other applications (e.g. Firefox after hitting F11) behave
differently when they are in fullscreen mode?

martin