The code that was trying to limit preview size changes was
running into some width-for-height pitfalls. It turns out
that the dialog behaves quite ok without this code, so just
remove it.
As an addition to 1042372670, themes might
want to avoid using the hardcoded GTK defaults for legacy GtkStyle
values. Add a gtkstyle-fallback style class that can be used by themes
to tweak the legacy GtkStyle defaults.
https://bugzilla.gnome.org/show_bug.cgi?id=679092
We can't expose colors with alpha in the GtkStyle colors, since
GdkColor has no alpha. Currently we throw away alpha completely,
which fails very badly for completely transparent backgrounds,
which now is the default for most widgets, as it typically
end up with black-on-black.
We handle this by falling back on the default/previous colors for
transparent colors. This is is simple and avoids complete failure.
https://bugzilla.gnome.org/show_bug.cgi?id=671437
In particular gtksettings.h and gtkstylecontext.h needed to be included
in lots of places now.
Also, I order the includes alphabetically in a bunch of headers.
This patch changes all uses of GDK_DEPRECATED(_FOR) in gtk headers
by the versioned variants, GDK_DEPRECATED_IN_3_x(_FOR). At the same
time, we add GDK_AVAILABLE_IN_3_x annotations for all API additions
in 3.2 and 3.4.
