[isabelle] Auto sledgehammer on completed lemmas

Hi all,

I've noticed after enabling auto-Sledgehammer that it (and friends like Nitpick) run on all the
lemmas in any file you open. So, for example, when you open a previously worked on theory,
Sledgehammer starts attacking lemmas that already have completed proofs. This isn't a large
impediment, but I just wanted to suggest that perhaps this behaviour could be improved on in future
by noticing the completed proof.

If there's a way to alter this behaviour that I have overlooked, please let me know and apologies
for the noise.



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