Gtk2/3: Update Label wrap sizing when text, font, or wrap mode changes after shown.
Gtk2/3: Update Label wrap sizing when text, font, or wrap mode changes after shown.

l8s/Eto,l8s/Eto,bbqchickenrobot/Eto-1,PowerOfCode/Eto,bbqchickenrobot/Eto-1,PowerOfCode/Eto,bbqchickenrobot/Eto-1,l8s/Eto,PowerOfCode/Eto