False negatives for length-zero-no-unit

[ncroll]

Clearly describe the bug

The length-zero-no-unit lint gives false negatives in a couple of scenarios related to flexbox.

Which rule, if any, is the bug related to?

length-zero-no-unit

What code is needed to reproduce the bug?

This fails even though the units are needed to disambiguate that we're using the shorthand for flex-basis:

.foo {
  flex: 0px; 
}

This fails even though units are required on flex-basis for IE 11 support:

.bar {
  flex: 1 1 0px;
}

What stylelint configuration is needed to reproduce the bug?

e.g.

{
  "rules": {
    "length-zero-no-unit": true
  }
}

Which version of stylelint are you using?

e.g. 13.11.0

How are you running stylelint: CLI, PostCSS plugin, Node.js API?

Node.js API

Does the bug relate to non-standard syntax (e.g. SCSS, Less etc.)?

No

What did you expect to happen?

No warnings to be flagged.

What actually happened (e.g. what warnings or errors did you get)?

e.g. "The following warnings were flagged:"

test.scss
test.scss: line 7, col 14 - Unexpected unit (length-zero-no-unit)

[ybiquitous]

@ncroll Thanks for reporting the issue. This has been resolved via #5315. Can you try the v14 branch, please?