[css-text-decor-4] Renamed text-decoration-trim to text-decoration-inset

[SebastianZ]

According to the resolution from #8402 (comment).

See also #13024 for the part of the {row|column}-rule-* properties.

Sebastian

[jfkthame]

There are also a number of mentions of "trim" in the description of the auto value that should be reworded, I think.

(While you're there, perhaps also fix the long-obsolete mention of text-decoration-skip-inset in the caption of the Chinese auto illustration.)

[SebastianZ]

There are also a number of mentions of "trim" in the description of the auto value that should be reworded, I think.

Replaced that by "length adjustments".

(While you're there, perhaps also fix the long-obsolete mention of text-decoration-skip-inset in the caption of the Chinese auto illustration.)

I renamed them all to text-decoration-inset now.

It seems we also had a text-decoration-skip-inset longhand for the text-decoration-skip shorthand at some point. As it seems it got replaced by text-decoration-inset at some point, I've now removed the remnants of the other property. That also means, text-decoration-inset is not a longhand for text-decoration-skip anymore.

Sebastian