Well, its a similar concept from differing domains, code editing, and tree viewing (commonly filesystems).

IME the former uses "fold/unfold" for the hiding of contiguous blocks of code whilst the latter uses "expand/collapse" for an information hierarchy. Certainly the underlying widgets do so:

http://www.scintilla.org/ScintillaDoc.html#Folding

https://developer.gnome.org/gtk3/stable/GtkTreeView.html#gtk-tree-view-expand-all

Emacs, Qt creator use fold/unfold, Eclipse does not have folds on the text buffer, but shows the structure in a tree view in a separate pane and uses expand/collapse in that tree view to fold/unfold the text, yes it uses both terms to describe the action.

I think its fine for Geany to follow the historical usage and leave both terms.

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