[Feature Request] Seed id hash with parent's id

[bullno1]

Currently, element id needs to be globally unique. Copy&paste or refactoring reusable components into functions would be a bit of a pain since you'd need to parameterize all the ids.

What if the id only has to be unique among siblings? Clay__Rehash already exists but it is only used for debugger. The fact that it exists mean that kind of id is useful.

CLAY_ID_AUTO on the other hand, does not allow providing a string and counter which are needed to identify elements independent of orders. e.g: In a list of items.

There are 2 ways of doing this:

• Make CLAY_ID and CLAY_IDI context-dependent. This might break some existing code.

  Floating attachment may be a bit harder but there are workarounds like saving the id into a variable first.

• Alternatively, provide CLAY_LOCAL_ID and CLAY_LOCAL_IDI which takes the parent id as seed. Alternate names:

  • CLAY_CTX_ID[I]: context dependent id
  • CLAY_SCOPED_ID[I]

I can make PR for either of these.