Some functions didn't check the class of objects they were passed but just
casted them to the type they expected. This lead to code like e.g. the following
to crash awesome:
c.titlebar = c
This adds a new function luaA_object_ref_class() which works like
luaA_object_ref(), but which also checks the class of the object.
Additionally, this function is now used in all necessary places.
Signed-off-by: Uli Schlachter <psychon@znc.in>
Signed-off-by: Julien Danjou <julien@danjou.info>
2b75950a8c