Dotted lines in left margins disappeared in version `0.2.0`

[plusvic]

Version 0.2.0 renders the left margin differently than version 0.1.5. See an example from application:

With version 0.1.5:

Error: error: global rule `test_2` depends on non-global rule `test_1`
    ╭─[test.yar:25:5]
    │
  8 │ rule test_1 {
    ·      ───┬──
    ·         ╰──── non-global rule `test_1` declared here
    ·
 23 │ global rule test_2 {
    ·             ───┬──
    ·                ╰──── global rule `test_2` declared here
    ·
 25 │     test_1
    ·     ───┬──
    ·        ╰──── `test_1` is used in the condition of `test_2`
────╯

With version 0.2.0:

error: global rule `test_2` depends on non-global rule `test_1`
    ╭─[test.yar:25:5]
    │
  8 │ rule test_1 {
    │      ───┬──
    │         ╰──── non-global rule `test_1` declared here
    │
 23 │ global rule test_2 {
    │             ───┬──
    │                ╰──── global rule `test_2` declared here
    │
 25 │     test_1
    │     ───┬──
    │        ╰──── `test_1` is used in the condition of `test_2`
────╯ 

Version 0.1.5 uses dotted lines as a visual indication of missing lines, while in version 0.2.0 the dotted lines disappeared and the result is an error report that is less clear than before.

I believe this an unintended change that was introduced here when draw.vbar_break was replaced with draw.vbar.

Or perhaps the intention was replacing the dotted lines with a solid line in a different color? If that's the case I would say that the dotted line (possibly on a different color too) is a better alternative, as it works in monochrome environments as well.

[zesterer]

This is a good point, I didn't consider monochrome environments. I think it would be a fairly trivial change to introduce a 'margin style' parameter that can be configured via Config. I'd be very happy to accept a PR for this. Alternatively, I can put it on my backlog to be done when I can find time.