[gtkada] Surprised by the changes to GTK 3.0

[Chris Sparks]

Hi Nicolas,

Bullets don't taste good! :-)  This is a valuable lesson for me because 
I knew I should have isolated the features I used from GDK because now I 
have to do it!

Chris
> Hello Chris,
>
>> I have been using GTK 2.x for a while and going to the 3.0 version really messed up years of personal software development.  I was wondering if anyone has a reference to how one converts from the 2.0 series to the 3.0 series?
> Yes, the GtkAda manual has a chapter about this, "Transitioning from GtkAda 2 to GtkAda 3". This contains an overview, and a package-by-package transition guide.
>
> You can also refer to the Gtk+ documentation at:
>
>    <https://developer.gnome.org/gtk3/3.3/gtk-migrating-2-to-3.html>
>
>> Very unhappy about this.
> I understand the frustration, this is a bullet we've all had to bite!
>
> For having gone through this in GPS, the most impacting change from the application developer's perspective was switching all the low-level drawing from Gdk to Cairo - the rest is fairly mechanical.
>
> Nicolas