Feature request: force cache update

Per Caching Behaviour for Categories, database cache is only updated on program restart.

It would be great to be able to force a cache update (perhaps from a right-click menu in the Symbol Chooser). When working with database parts, if library assignments are made in the database, its painful to have to close and re-open KiCad to get the database to refresh with the new assignments.

Best would be to raise this request on github so the devs can see it.