Fix declaration-block-no-redundant-longhand-properties false negatives for inset shorthand

[Mouvedia]

Demand

top: 0;
right: 0;
bottom: 0;
left: 0;

should get fixed to

inset: 0;

i.e. add inset property to this list

prompted by #6580 (comment)

[DeRaowl]

Hi @Mouvedia , I have gone through the issue and can I work on this one?

[Mouvedia]

@DeRaowl normally you should wait for the status: ready to implement label to be added to the issue.
@jeddy3 can I add it?

one caveat though: if you start before #6580 merge, you will have to refactor your code

[DeRaowl]

Ack, will wait for the status to be updated. Thank you.

[Mouvedia]

@DeRaowl Meanwhile you can read about how to fix a bug in a rule in the developer guide and check the 8 good first issues that are ready to be implemented.

[jeddy3]

@Mouvedia Thanks for creating the issue.

@DeRaowl Thanks for offering to work on it.

one caveat though: if you start before #6580 merge, you will have to refactor your code

Let's wait until #6580 is merged before starting

[DeRaowl]

@jeddy3 can I pick this issue?

[ybiquitous]

@DeRaowl Yeah, of course!

[hail2u]

I think the rule is also false negative for (border|margin|padding)-(block|inline). For example:

margin-block-end: 0;
margin-block-start: 0;

should be:

margin-block: 0;

[Mouvedia]

It's been more than 2 weeks, it's available again.

[rayrw]

Hi, I'd like to pick this one if it's okay.