Builder: Fix wrong use of @retval for output args [master]
@retval is for documenting the meanings of particular values of the returned variable, not output reference/pointer arguments like this.
These were the only uses of
gtkmm (at least
master). This should also be cherry-picked to
There are more such occurrences of
glibmm; I can prepare an MR for that, too.
In practice, I guess it is in one way convenient that Doxygen produces a section headed "Return values" and puts the output argument in there, but I don't think the current usage is semantically correct, and it seems better to have all the arguments together in order anyway.