Combine tree edit

[yassam]

I've edited dgrid so that it's possible to to combine tree and editor. For it to work, the editor has to wrap a tree, e.g. editor(tree(column)).

I haven't added any test code nor updated any of the docs, and I've only tested it against my own specific case where the tree is only 1 level deep.

[ghost]

Thanks for this pull request! I actually had been in progress of working on this from the opposite angle (wrapping tree around editor) and just committed that; however, I saw a couple of other ideas in here that might also be useful in the future.

I would say I'm a bit concerned at the approach here which seems to put some amount of tree-specific logic within the editor module; such conflation of concerns was something I tried to avoid. However, it'd certainly be ideal if both directions can eventually be supported.

[yassam]

I actually had been in progress of working on this from the opposite angle (wrapping tree around editor) and just committed that

No problem - I'll check out your changes soon. I'm not precious about my code so feel free to close this pull request if you don't need the code. I'd rather use the upstream version than maintain my own.

I would say I'm a bit concerned at the approach here which seems to put some amount of tree-specific logic within the editor module

I was concerned about that too. It felt wrong to wrap the tree in an editor rather than vice-versa, but I started off with that and I was in a hurry so I kept going with it.