We allowed moving text range to its end but not to its start. It seems better to allow the symmetric operation, rather than perform correct validation in client code.

Presentation text could be null or empty. Not sure whether we need to distinguish these two cases, but it worked like this before

The original code was reviewed as a part of referred review

JavaStubPsiElement: there's no need to call AST.subtreeChanged from PSI, it's usually the other way round

This reverts commit 11095e0a