This is meant as an input to the font chooser.
We don't want the user to select a language, but
rather have fonts presented as they would work for
the current language. Therefore, do away with the
lang/script combo on the tweak page.
Add a button the dialog's header bar that lets us
switch to a second page where we can customize
the selected font.
Make the font chooser widget export an action that the
dialog can use for the button. This has some advantages:
- we can export not just the toggle state, but also enabled
- we can reuse the same enabled state to make the select
button insensitive when no font is selected
To determine whether a font is selected, listen to changes
of the list selection. And ensure that the font chooser is
in an initial state when mapped, even if we close the dialog
from the tweak page.
Previously, we would pango_font_describe() every time the code ran and
we wouldn't ever hit the optimized quick exit.
The code now is a lot more complex because the
compute-actual-value-when-required-the-first-time approach is not
supported out of the box in GtkTreeModel (or GValue).
This subdirectory gets in the way when integrating the inspector
build more fully with GTK+, and does not really add anything.
Just move everything one level up.
