Issue #2764931 by tedbow, tim.plunkett, nod_, drpal, droplet, dawehner, Wim Leers, phenaproxima: Contextual links don't work with 'use-ajax' links

Issue #2650910 by drpal, Anishnirmal, markdorison, Tom Robert, psend, yannickoo, rachel_norfolk, Wim Leers, droplet: Contextual links button is always rendered even when no links are available (with warm client-side cache)