Changes min rows on a textarea inside a MatFormField is not reflected in a runtime.

[tofesath]

Bug, feature request, or proposal:

The change of minRows in a runtime is reflected after the change of value.

What is the expected behavior?

The change of minRows is reflected right now.

What is the current behavior?

The change of minRows is not reflected until the value is changed.

What are the steps to reproduce?

• Click a button Toggle min rows (the button switch between a 2 values: 3 and 5).

Min rows is not reflected, you have to write some content then the textarea is updated.

https://stackblitz.com/edit/angular-bzr5pv

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

angular - 6.0.1, material - 6.2.0, browser - chrome

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