[BUG] Property slider view default unit

I created a example/demo where it's visible that the configuration is the same in both scenarios

Actually, you didn't indicate the defaults, where in case of line-height takes normal by default and so resets its unit on initialization

@artf I think that this specific fix messed up the properties without units, like Opacity. The slider behaves weirdly in this case, even on the demo.

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