Folder: preserve icon layout on sorted mode after drag and drop

When we're in sorted mode (e.g. sorted by name) and we perform drag and drop operation, our unsorted icon layout is overriden by a sorted layout.

Previously after drag and drop operation we get back to old unsorted layout, so it was impossible to make use of sorted layout to reorganize our icons. Moreover it was a bit confusing that moving an icon changed entire layout.

We can still go back to our unsorted layout as long as we don't perform drag and drop operation on desktop.