While not officially deprecated, the use of jquery.spinner is discouraged (per @Jdforrester-WMF). Hopefully it shouldn't be too complicated to swap it out for OOUI's progress bar (which is less discouraged than the spinner...)
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| jquery.spinner | OOUI |
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Not really feeling this is a UI improvement, it's much more distracting/in-your-face than the previous spinner.
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I don't know that many people use the console anyway (it is super opaque in use and I don't get it myself :), so we're looking at probably quite a very small impact even if everyone hates it.
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Makes sense, except that I use the console and have no intention of submitting a patch I hate ;-)