>>107
What an idiotic way to waste a day or two. I did downgrade to 24.5.1 (early-2015) and with the exception of Selectrum everything I had simply worked out of the box. My understanding is that I unfortunately can't realistically go further back than 24.1 (mid-2012), and certainly no further than 23.1 (mid-2009) because there were certain modifications there which allowed for civilized ``completing-read'' based completion frameworks. Vertico seems a little nicer to me than Selectrum, so if I feel like wasting time I might give back-porting this a go.