Incoherent behaviour with preview (detailRenderer) on simple/double click

[ylacaute]

Bug: When you are navigating in the tree with simple click, the renderDetails function does not always return the selected file. When you double click, the last renderDetails return the good file (but spams events).

Version: 1.6.0 and master branch.

Expected behaviour: the renderDetails has always the selected file, folder or file, exactly as onSelectFile prop, on simple or double click.

I tryed to write a PR but I am afraid to refactor too many things. I don't understand why you dissociate selection and preview behaviour, with simple and double click. Anyway the result is very confusing for the final user.

I think it would be better to active preview on each click.