Allow multiple classes in the class-tuple syntax about leptos HOT 4 CLOSED

I am open to providing some alternate API to simultaneously set or un-set multiple classes in response to the same reactive change, and possibly checking for whitespace in the class name in the view macro and splitting them at runtime.

I'm not open to splitting the string at runtime for class:/class=(_, _) in general unless it's purely opt-in: if class:foo=some_condition requires checking whether "foo" contains whitespace or wrapping it in a JS Array, it's just pure overhead.

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If this seems like something worth tackling, I'm happy to issue a PR.

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I'll take a look and see what I can put together. Agreed that it should be done in the view macro.

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Feature added by #2532. Nice work!

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