Make gtk3 the default gtk

[wkennington]

Support should be included in many common applications and this is the future direction as dictated by gnome. In firefox this seems to be a performance win and makes it more usable on hiDPI displays. These improvements should translate to other gtk2 -> gtk3 applications.

[vcunat]

I believe most packages shouldn't use the unversioned gtk attribute. Maybe for those actually supporting both, but that seems rare and often the expression needs other changes, so it seems better to provide "switching" between the two possibilities by a separate flag anyway.

[wkennington]

This is what I was hoping for, using gtk3 where possible and gtk2 only
where needed.

On Sat, Aug 8, 2015, 06:09 Vladimír Čunát notifications@github.com wrote:

I believe most packages shouldn't use the unversioned gtk attribute.
Maybe for those actually supporting both, but that seems rare and often the
expression needs other changes, so it seems better to provide "switching"
between the two possibilities by a separate flag anyway.

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#9164 (comment).

[jtojnar]

Superseded by #18559