Note that Autotools support is now disabled in lp:inkscape, and the CMake build allows the use of deprecated symbols. Hopefully, this should have fixed the problem.
As a better solution, we need to add a conditional build so that systems with Gtkmm >= 3.20 use the new Gdk::Seat API.
Eventually, the issue will disappear when we bump this to a hard dependency.
Should be fixed in Inkscape 0.92 with the workaround in:
lp:inkscape/0.92.x r15030
Note that Autotools support is now disabled in lp:inkscape, and the CMake build allows the use of deprecated symbols. Hopefully, this should have fixed the problem.
As a better solution, we need to add a conditional build so that systems with Gtkmm >= 3.20 use the new Gdk::Seat API.
Eventually, the issue will disappear when we bump this to a hard dependency.