Provide a mechanism for hiding the "Quit", "About" and "Preferences"
menu items from the normal places in a traditional menubar layout (in
the File and Edit menus) when the menu is being rendered in the Mac OS
menubar.
These items can already be found in the application menu.
With this feature, applications can now define a single menu to use in
all 'traditional' scenarios.
Use this new attribute in Bloatpad.
https://bugzilla.gnome.org/show_bug.cgi?id=741610
Currently we only take into account the window GActionGroup for
activating the accels.
However, the application could have some custom GActionGroup in the
chain of focused widgets that could want to activate some action if
some accel is activated while that widget is focused.
To allow applications to set accels on widgets that use custom
GActionGroups, simply use the muxer of the focused widget, which
already contains the actions of the parents.
https://bugzilla.gnome.org/show_bug.cgi?id=740682
Rename the "toggled" property to "active", since that is what
GtkActionHelper expects to update for check and radio actions.
Also make the property readable, since GtkActionHelper wants
to read it.
We don't want separators in both side of an iconic section
and use a 10px margin to separate two iconic sections.
Separators are also updated in case of dynamic insertion
( often used with menu items for plugins )
https://bugzilla.gnome.org/show_bug.cgi?id=738650
...unless they are labeled.
To implement this, keep track of the nesting depth of section boxes,
starting from 0 for the toplevel and the submenu ones, and only
insert unlabeled separators if the depth is at most 1.
Instead of using GtkMenuTracker to flatten the sections into a single
linear menu, handle the sections ourselves by nesting boxes.
Each section gets an inner and outer box. The inner box numbers its
children in the way that the tracker instructs. The outer box
containes the inner box and the separator, if appropriate.
Having the two separate boxes will allow us to change the orientation of
the inner box if we want to pack widgets horizontally within a section.
