For most use case having our signals on an "application" object makes sense, as
they are meant as global events. We could have object-specific ones, but some
are truly useful as is, not only `new` and `open` can't be on a `Document`
object as @kugel- pointed out, but many others are really handy to have
globally instead of one handler per document: many plugin don't really care to
attach to each document, and rather want the event in any one. This avoids
doing stuff like `foreach (geany_documents as doc) { doc.connect(...); }`,
which would also be less optimized, and would require to also
`geany_app.connect("document-new", (app, doc) => { doc.connect(...) })` and
same for `new`.
My point being that some signals are great for global events and make sense to
be on the application/window rather than on each specific document (or alike).
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