The application of the auto-complete renderer to the fix/affected versions field and components field is a welcome addition to Jira.
What would be even more useful is if the auto-complete renderer could also be applied to any multi-select and/or multi-checkboxes custom field.
We've got one particularly large multi-checkboxes custom field that has options added to it at a rate of 1 or 2 options a week. As it stands it causes major screen real estate problems when using "simple" searching.
The "advanced" searching JQL auto-complete actually already offers auto-complete for the field in question, but for our less advanced users, we'd love to see something closer to the components/versions/labels auto-completion style in the simple searching (and general issue editing/moving) views.
The multi select field renderer can be changed by enabling "multiselect.frother.renderer" dark feature