Moving file (by dnd5) into not loaded lazyload content prevents from future loading that content.

[Roinoss]

Test in: https://wwwendt.de/tech/fancytree/demo/index.html#sample-multi-ext.html
Reproduce steps:
1.: Move another file or folder to "More.." folder.
1a.: If you drag over and wait few seconds its lazyload content, if you drop instantly:
2.: Dropped file/folder is added to "More.." folder but its content isn't loaded.
2a.: As 1a lazyloads content, behavior in 2. is probably unintended.

[Roinoss]

For me there should be also an option to just lazy load data for node before dropping:

				} else if (dndOpts.forceLoadLazyParents && !node.isLoaded()) {
					node.load();
				} else if (dndOpts.preventLazyParents && !node.isLoaded()) {
					node.warn("Drop over unloaded target node prevented.");
					DRAG_ENTER_RESPONSE = false;
					break;
				}

(ofc similar code in dragDrop also do a job:

if(!node.isLoaded()) {
    node.load().done(dropHere(data, node));
} else {
   dropHere(data, node) ;
}

function dropHere(data, node) {
 //do something on drop
}

)