Don't collapse one line of code

[cherifGsoul]

This is needed by canjs/bit-docs-html-canjs#556

This prevent collapsing one line of code, for example the following will not collapse line 1 and 8:

// Creates a mock backend with 3 todos
import { todoFixture } from "//unpkg.com/can-demo-models@5";
todoFixture(3);

import { Component } from "//unpkg.com/can@5/core.mjs";

Component.extend({
	tag: "todos-app",
	view: `
		<h1>Today’s to-dos</h1>
	`,
	ViewModel: {
	}
});
<span line-highlight='2-7,9-14,only'/>

Fixes canjs/bit-docs-html-canjs#556

[justinbmeyer]

@cherifGsoul can you explain this logic change? Would this show the lines between a set of highlights like:

@highlight 1-3,33-55

range[0] > current + padding would be true when range[0] is 33

[cherifGsoul]

@justinbmeyer The logic is to compare the first line and the last line of collapsible:

• Using current which is initialized to 1 or calculated in this expression at the end of the loop current = (range[1] || range[0]) + padding + 1
• In each iteration of the loop collapseEnd is calculated based on the first item range[0] of the new range of line highlight collapseEnd = (range[0] - 1 - padding)

In short:
current = currentRange[1] + 1 + padding
next = nextRange[0] - 1 - padding

next - current should be greater than 1 to make a collapsible

So for @highlight 1-3,33-55 we have a collapsible between [7, 29] and it shows only the 3 lines for padding between highlights:
current = 3 + 1 + 3 // => start collapsible from line 7
next = 33 - 1 - 3 // => close collapsing at the line 29