Always have Since: annotations at the very bottom, use the correct
ClassName::signal-name/ClassName:property-name syntax, fix a few typos
in type names, wrong function names, non-existing type names, etc.
When doing a gtk_widget_show_all() on the shortcuts window,
accelerators for both RTL and LTR directions are being shown.
Make sure that no-show-all is set by default on hidden shortcuts, and
updated if the widget direction changes.
https://bugzilla.gnome.org/show_bug.cgi?id=759541
It turns out that it is nicer in glade to have just a single
widget that can show either a shortcut or a gesture, so make
GtkShortcutsShortcut do it both.
GtkShortcutsGesture is now redundant and will be removed before
the next stable release.
The prime example for direction-dependent shortcuts is using
<Alt>Left or <Alt>Right to go back. Support this by adding a
direction property to GtkShortcutsShortcut, and filtering by
the current text direction.
https://bugzilla.gnome.org/show_bug.cgi?id=757888
