Popper: provide preMiddlewares/postMiddlewares params

[teidesu]

🚀 Feature request

/subj

🧱 Problem Statement / Justification

sometimes the built-in defaults are not enough for the desired behavior and adding custom middlewares is needed. currently there's no way to inject additional middlewares that would augment the default behavior

✅ Proposed solution or API

adding these to PositioningOptions:

preMiddlewares?: Middleware[]
postMiddlewares?: Middleware[]

as well as adding them in the middleware array here

↩️ Alternatives

alternatively, it could accept middlewares: Middleware[] that would replace any "default" positioning middlewares (well, except those used internally) and make it ignore params like flip/slide/..., though imo it's less clean

while technically achievable right now via updatePosition, it's a everything-or-nothing kind of api, where you either just run the passed default implementation and hack around it, or implement all positioning yourself. and neither is ideal.

📝 Additional Information

my specific use-case is a slightly modified version of the shift middleware that gives up shifting entirely beyond a certain position (so that the later middlewares can handle positioning instead, e.g. flip).

this is currently not possible with zag because:

• shift middleware runs after flip
• the default shift middleware doesn't let me pass a custom limiter
• i can't pass custom pre/post middlewares to work around the above limitations