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.
The gesture functionality was taken over by GtkShortcutsShortcut,
so this widget is no longer needed, and it never was in a stable
release, so lets get rid of it.
The current code in gtkshortcutswindow.c is good enough to
construct a widget once from a .ui file, but fails to handle
changes at runtime, as happen e.g. in glade. Fix this by
listening for changes to section-name and title.
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
