> the new version seems to drop GTK2 support,
Yes, the new version installs in parallel with the old version. Lots of libraries have done this recently.
> 2 different goocanvas sources for a gtk2 and a gtk3 build
Yes, of course.
> the new version seems to drop GTK2 support,
Yes, the new version installs in parallel with the old version. Lots of libraries have done this recently.
> 2 different goocanvas sources for a gtk2 and a gtk3 build
Yes, of course.