In 2010b175, it was suggested just not to suggest parentheses removal.
However, it contradicts with behaviour of "Replace contains" which
adds semicolon before lambda in this case. So in this commit I made
behaviour of remove parentheses the same.
This commit reverts production part of 2010b175
Fixes failing test of "replace contains"
Operator priority calculation for 'this' expressions was incorrect in
JetPsiUtil.getPriority(): it would return a very low value for
a JetThisExpression, causing the IDE to report that parenthesis
are necessary in an expression like '(this)[1]'.
Fix this by making JetThisExpression not implement
JetStatementExpression by removing the implements clause from
JetLabelQualifiedInstanceExpression and adding it to all other
subclasses of JetLabelQualifiedInstanceExpression.
Fixes KT-4513.
Alex Chmyr