Nothing sets a sensitivity callback, and this induces a lot of bookkeeping to
track. When things are GObject, then interested parties can connect to property
notification instead of these callbacks.
Testing Done:
Compiled only.
Reviewed at https://reviews.imfreedom.org/r/2310/
PidginandFinch:ThePimpin' Penguin IM Clients That'reGoodfortheSoul
Thisfileintendstolistallchangestolibpurple,Pidgin,andFinch's public