Prevented interferance with the user's action if they interacted with
something below the tags, since a new row would be added on blur and
hence shift down positions.
For #3931
Old system was hard to track in terms of usage and it's application of
'components' properties directly to elements was shoddy.
This routes usage via the components service, with element-specific
component usage tracked via a local weakmap.
Updated existing found usages to use the new system.
