Map JSON feature remains painted when correspondent item is not selected

[patrickdalla]

When changing item selection direclty from MAP, the old last visible JSON feature is not hidden if the new selected item does not have its own JSON feature.

When implementing solution for #2208, i found noticed this issue.

Although, this seems to be more related with modifications done in PR #2088, so, as it was not merged yet, I will use the same branch.

The json feature of the last selected item is managed internally in map javascript in a decoupled way of its correspondent mark. It was done so to avoid memory usage of unseen features, as all marks are kept in mem even when hidden (to increase speed), but keeping correspondent json features could increase memory size.