Inconsistent bb-code argument parsing

[Xon]

Putting "" in a bb-code's argument mostly works, but has some odd edge cases.

Works: [img title=""test""]https://xenforo.com/community/styles/default/xenforo/xenforo-logo.png[/img]
Works: [img title="a "test""]https://xenforo.com/community/styles/default/xenforo/xenforo-logo.png[/img]
Does not work: [img title="a "test" "]https://xenforo.com/community/styles/default/xenforo/xenforo-logo.png[/img]
Does not work: [img title="a "test"...

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