[isabelle] Parallelising apply-style proofs

Hello all,

When working in Isabelle/jEdit with parallel proofs set to 2, "by" does not impede progress through
the theory. By which I mean a "by" step can remain purple and being processed while the rest of the
theory proceeds. The same does not seem to be true of a proof with many "apply" steps followed by a
"done." Is there a fundamental reason this doesn't happen or is this just a design decision? It
seems to me that processing could proceed past the proof as soon as the lemma statement itself has
been parsed.

This isn't a complaint as I realise there are several potential work arounds for this like using an
Isar proof or enabling skip proofs. I was just curious why this doesn't happen.



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