MatFormField with appearance="outline" draws line through the label if the form field starts out as "display: none."

[grant77]

Bug, feature request, or proposal:

MatFormField with appearance="outline" draws line through the label if the form field starts out as "display: none." Is see Bug #12555, but I don't think it covers this scenario. I have provided a very simple stackblitz to duplicate.

What is the expected behavior?

There should not be a line going though the label.

What is the current behavior?

There is a line going though the label.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-material2-issue-ovrlab

What is the use-case or motivation for changing an existing behavior?

It's ugly.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

"@angular/material": "7.0.2"

Is there anything else we should know?

No.

[mmalerba]

@crisbeto did your PR for this land yet?

[crisbeto]

Doesn't look like it has #13477.

[mmalerba]

closing as a dup of #13328, should be fixed by #13477

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