... when platform plugins are using compatibility APIs.
Even though QPA is not a public API and does not promise source/binary
compatibility, we still try to not break things when possible. Eventually
deprectated APIs will be dropped (e.g between major Qt versions). Having
deprecation warnings here would help maintainers to notice API changes even
before their code stops compiling due to removed QPA APIs. This will also
ensure that we won't forget to remove compatibility APIs.
Change-Id: If13786eb7d42a595708ace00b2ddea5209df18db
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
ab8ea993b3