q-select: Add a prop to reduce the height when the label is not displayed

[zeodtr]

I want to reduce the height of q-select.
I've removed the label by setting label prop to undefined, but q-select's height remains the same.
Even with dense prop set to true, it is too tall for me (The result height is 40px).
I've managed to reduce the height of q-select by applying the following scss. But I think it is a hack, since it uses the undocumented css classes.

$height: 30px;
:deep(.q-field__control) {
    min-height: $height !important;
    height: auto !important;
    padding-right: 4px !important;
    .q-field__native {
        min-height: $height !important;
        height: auto !important;
    }
    .q-field__append {
        min-height: $height !important;
        height: auto !important;
    }
}

It would be nice if the height could be reduced by a prop.

BTW, I've looked at the source code of quasar, and found that the height is kind of hard-coded.
https://github.com/quasarframework/quasar/blob/dev/ui/src/components/field/QField.sass

Thanks.