linear stepper add attribute skippable.

[TonyFoster]

Feature Description

Although optional step are already skippable, but you can skip it with invalid input. I hope there is an attribute that make step are skippable when it has a valid input(can be auto fill).

Use Case

I have a form that use to post something. And user are quite often to have a post. And the form have max in 11 steps. And I don't want user visit all autofill step in every time. But I don't want accept invalid values cause I set step to optional.

When I using approach:
[optional]="step.vaild"
It's works, But "optional" will show up on the screen when user fill up the step. it's kinda weird.

Because I was using same form for user edit their post. In this scenario, all step are autofilled and valid. When user edit some step, the stepper must set to linear to prevent user send invalid values. This make all step no skippable, until step by step start again. So I have to set every step interacted= true in order to allow user skip all valid step which already posted, autofilled, valid and just edit some step base on their needs. And I can't use optional, cause that will allow invalid inputs.

So I hope there is a new attribute "skippable" with only behavior which allow step can be skip when it's valid.

[devversion]

Hello! I think this is a reasonable feature request. I think we'd need to think how we can disambiguate the names as optional and skippable seem very closely related. Ideally we'd come up with something better. e.g.. optional by default does not allow invalid form groups, unless someone explicitly opts out.

Additionally, I think it would be great if the stpeper would not allow editing if editable is set to false. It currently still allows that for once until interacted is set to true. That seems wrong to me.

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