The need of a specialised fixed layout container that can be placed into
a GtkScrolledWindow ceased to exist once GtkScrolledWindow gained the
ability to automatically interpose a GtkViewport when adding a child
that does not implement GtkScrollable.
All the other justifications that led to the existence of GtkLayout as a
separate widget from GtkFixed have been largely made irrelevant in the
20 years since its inception.
This is a bit of filechooser internals that gets shared with
nautilus, which is fine, but it shouldn't be part of our
public API. There are no other users than nautilus.
As the summary says, this allows using g_autoptr(GtkTreePath). This is
useful for API that uses out parameters for GtkTreePath that need to be
freed.
https://bugzilla.gnome.org/show_bug.cgi?id=791234
These complicate a lot of GdkWindow internals to implement features
that not a lot of apps use, and will be better achieved using gsk.
So, we just drop it all.
* Cover letter
Having a single header file for all autocleanups definitions was a
reasonable stop-gap measure, but now GTK+ is starting to use G_DECLARE_*
macros. This means that every class using a G_DECLARE_* macro will need
to include "gtk.h" to avoid compiler warnings, which is not acceptable.
By moving the G_DEFINE_AUTO* use to the header that defines the type we
allow using the G_DECLARE_* macros without sacrificing the ability to
include only the needed files when deriving from a class.
* Commit
This commit changes all includes relative to GtkWindow to define their
own autocleanup macros.
