Problem/Motivation
View UI edit form provides smaller Dropbutton by providing extra CSS in its admin styling.
The problem is that it is impossible to re-use the smaller variant of Views UI Dropbutton without repeating the CSS.
Proposed resolution
Provide a way (by an optional property) to specify Dropbutton variants (e.g. in the same way that Button variants provided).
Remaining tasks
Discuss.
Patch.
User interface changes
@todo
API changes
@todo
Data model changes
@todo
Release notes snippet
@todo