[Console] Autocomplete cleanups/optimisations
merged branch lmcd/autocomplete-cleanups (PR #6594)

This PR was squashed before being merged into the master branch (closes #6594).

Commits
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9d94fc7 [Console] Autocomplete cleanups/optimisations

Discussion
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[Console] Autocomplete cleanups/optimisations

I know the optimisations to this code are getting kinda ridiculous, but I found a few more things to tidy up.