Adopt the onEnter rules inside of the reindent lines command

[aiday-mar]

This was noticed in the following comment #209863 (comment). When applying the Reindent Lines operations, the onEnter rules are not referred to. As a result, the indentation after applying the Reindent Lines command does not match the indentation when typing the same code from top to bottom.

Since we are using the Reindent Lines code in order to detect cases of failing indentation, if we adopt the onEnter rules now, this could eclipse the indentation issues in our regexes and the code. Hence the onEnter rules should be adopted towards the end of the improvement cycle.