use ensureValid (EA-50088)
a bit more diagnostics for getText inconsistencies (EA-49937)
cleanup
more diagnostics for TypeConversionUtil.getSuperClassSubstitutor (EA-49926)
if type's class is invalid, display its invalidity diagnostics (EA-49843)
don't let rendering exceptions spoil completion state (EA-30289)
let lookup iself hide when the editor is hidden (EA-40772)
diagnostics instead of NPE when accessing disposed lookup (EA-48887)
diagnostics instead of SIOOBE when checking completion copy consistency (EA-48732)
more diagnostics for JavaChainLookupElement insertion assertion (EA-50180)