xref #4810: allow using pgi instead of gi as bindings for gtk3.
The only reason to use pgi is really to allow testing on Travis (and similar contexts), hence the deliberate choice not to expose a rcParam.
PR Checklist
Has Pytest style unit tests
Code is PEP 8 compliant
New features are documented, with examples if plot related
Documentation is sphinx and numpydoc compliant
Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way
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PR Summary
xref #4810: allow using pgi instead of gi as bindings for gtk3.
The only reason to use pgi is really to allow testing on Travis (and similar contexts), hence the deliberate choice not to expose a rcParam.
PR Checklist