Support native <select> in mat-form-field

[jelbourn]

Should work similarly to using mat-form-field with an <input>. Styling is obviously best-effort, since we don't have full control over how the OS renders options.

[vivian-hu-zz]

It is resolved as PR #12707.

[jelling]

Can I ask what prompted this feature? Is there a known performance issue? I'm seeing a bug with mat-select in v6 where the same mat-control code renders mat-options in some scenarios but not in others.

[jelbourn]

@jelling It gives people more options. A native select is inherently more performant, more accessible, and has less code. The trade-off is that you can't use custom HTML in the options.

If you have a bug to report, please open a new issue.

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