Bug#1061203: gtkmm2.4: upstream branch is end-of life

[Bastian Germann]

Source: gtkmm2.4
Severity: serious

While gtkmm 3.x and 4.x are still maintained, gtkmm2.4 is abandoned upstream.
It should not be released with trixie, even if the gtk2 removal does not happen.
A popular reverse dependency is ardour, which is in the process of vendoring the
gtkmm2.4 parts that it needs, so ardour should not be considered a blocker.