Hot can I forbid drag for a Tab ?

[enomado]

Seems it cant, currently. I want to contribute, but I have some questions regarding current design.

1. It seems you dont rely on deep feedback loops on on_edit, for example. Its kind of signal, not callback. Why?
2. If i'm ok with preview, and just want to forbid final tree modification? Can be final modification exposed to callback?
3. Moreover, I want history of tree modification(for undo). Could be model splitted from ui, and mutations go throught user code, as lists of diffs, or clones. It could be done with catching "on_drag_start" signal - clone tree and have two trees, for example.

[rustley]

I need this as well.