fix(input): theming mixin error

[crisbeto]

• Fixes an error in the input theming mixin that was caused by a nested mixin.
• Removes the mat-input- prefix from the mixin local variables since they're not exposed and don't need to be prefixed.

Fixes #5232.

[jelbourn]

LGTM

[xonuzofa]

Your fix allows me to build but is causing an issue with the prefix like so:

<div class="col-sm-6">
    <md-input-container>
        <input mdInput type="text" placeholder="Final Price" formControlName="cost_string">
            <span md-prefix *ngIf="form.controls.cost_string.value">$&nbsp;</span>
    </md-input-container>
</div>

[crisbeto]

@xonuzofa These changes only rename some variables and move the mixin out of the other mixin, there is no way for them the affect the prefix. I've checked it against our demo app and it works as expected. That being said, I think your issue comes from the fact that you're using md-prefix, instead of mdPrefix. If you change your span to this, it should work:

<span mdPrefix *ngIf="form.controls.cost_string.value">$&nbsp;</span>

[xonuzofa]

You are absolutely correct. Thanks!

[aarmora]

Is there any planned time for this to be merged? Or is there a workaround in the meantime?

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