I think geany need a few features to improve the usability when more than one window (or instance) is involved.
Here are the ones that I miss the most : Ability to create an empty instance (Or at least open a new document in a new window) Ability to move a document to a new window without duplicating it (currently the version on the old instance remains open) Ability to move a document to an other already exiting instance.
Currently using Geany 1.32 from apt on Tricia