Ids are not properly set for subsymbols within a symbol group.

[viampietro]

There are few problems concerning the distribution of ids to subsymbols within a symbol group.

• Ids are not well calculated when copying a symbol group.
• Ids are not well calculated when creating a new symbol group from the palette.
• Also, when creating a new symbol by cmd+click in a group, the id is not set at all (stays {type}/{palette})

I think the main problem is that there is no direct referencing between sub-components in a group and their sub-symbols. Sub-components don't have a pointer to their related sub-symbol entries in the group bundle.

I agree that all graphic components should have an attached symbol created in the model's score, and that symbol a group should own a list of pointers to their sub-symbols and not possess the entire bundles.