Marking large design changes as major

[gfellerph]

Context

We received a lot of feedback from Design Changes that were released under patch or minor versions but changed the appearance of components in a major way (#3490).

Decision

We are marking major Design Changes as major change with changesets.

Consequences

Major Design Changes that would not break the technical implementation will have to be buffered together with other, technically breaking changes, potentially delaying their release.

Example (optional)

New disabled styles with dotted border and stroke. That change sparked a lot of controversy.