Merge commit '722771973bd' into patches/lyslyskom22891031
* commit '722771973bd': (6177 commits)
Verify that callablep responses are aligned with reality.
Merge remote-tracking branch 'origin/8.1' into gobject-introspection
Fix the documented inheritance for GTK2.CellRendererSpin
Add property list for GTK2.CellRendererSpin
Merge remote-tracking branch 'origin/8.0' into string_alloc
Update GTK2 docs based on source files (including the additional options)