Line Highlight: Account for offset when clamping ranges

[RunDevelopment]

This fixes #3517.

This was caused by #3475. I failed to take the offset into account when giving my suggestion.

Screenshot of the example in #3517 working.

[github-actions]

JS File Size Changes (gzipped)

A total of 1 files have changed, with a combined diff of +1 B (+0.1%).

file	master	pull	size diff	% diff
plugins/line-highlight/prism-line-highlight.min.js	1.52 KB	1.52 KB	+1 B	+0.1%

Generated by 🚫 dangerJS against 95c2e4d

[JaKXz]

I see that the line-highlight plugin does not have any tests. I think adding one would be good as part of this PR, if possible

[RunDevelopment]

I added tests in #3524. This PR is now blocked by #3524.

[RunDevelopment]

Alright, so #3524 is not gonna happen until #3408 which require v2. So either we change our stance on #3408 or we merge this PR without tests and add them in later.

I don't want to have a bunch of long expected HTML in the test files, so I don't want to do these tests without snapshots.

Also, I'll likely have a bit of time on my hands next week, so I could start work with v2. So merging this PR now, making the last v1 release with weekend, and then starting with v2 would be my preferred timeline.

Thoughts? @JaKXz @mAAdhaTTah @Golmote @LeaVerou

[mAAdhaTTah]

we merge this PR without tests and add them in later.

That seems fine. Let's go w/ it.

[JaKXz]

Agreed with @mAAdhaTTah 👍🏽