dropped node gets expanded even if it was collapsed when dragged

[jrencz]

Steps to reproduce the issue (http://jimliu.github.io/angular-ui-tree/ as a reference):

1. Collapse a node with children - let's say "2. moiré-vision",
2. Drag it - it is dragged as collapsed.
3. Drop it (position may or may not change) - it gets expanded

Dragged element gets new scope ID. In fact the new element gets created but only its $modelValue is the same. Other node properties (like collapsed flag) may be transferred to the new node.

[JimLiu]

Yes, I knew that when I was adding the collapsed property, but I had no idea about it at that time.
Last time I added the $nodeMap object to storage the mapping of $modelValue->$scope.
Now I have a idea, we could add a $collapsedMap object to storage the mapping of $modelValue->collapsed.

So what do you think?

[jrencz]

Collapsed is not the only binary flag there can be.
In my own use case I have 2 others (including one for switching node editable)

I suggest encapsulating all the flags (both dafault ones as 'collapsed' is now and custom) in 'flags' property. So let there be '$flags' or '$nodeProperties' as 3rd argument of includeNode()?

[jrencz]

works as expected. Thank you