Deprecate old API for some time before removing it
Basically every new poppler release removes some API from libpoppler.so, which makes it rather difficult to ship a newer version of poppler as that breaks several of the users. I understand that supporting some new features may require incompatible changes, and even that this library is marked as unstable. But it wouldn't hurt much to deprecate symbols and keep them for some releases before removing them, whenever that's possible (e.g. for the recent GBool et al removal). This would help distributions ship newer versions of poppler faster, and apps move to them faster as well, which would be a nice outcome.
I could prepare a patch to add some POPPLER_DEPRECATED macros if that would help.
Thanks for considering.