[disabled] state should respect [raised]

[icmdaf]

The current default style applies a background color to all disabled buttons.
But according to the material spec, flat disabled buttons don't have a background, just gray text.

Can we split the style and align it closer with the spec (also using the theme colors for disabled text instead of the hardcoded grey value etc)

:host([disabled]:not([raised])) {
  ...
  @apply(--paper-button-disabled);
  @apply(--paper-button-flat-disabled);
}
:host([disabled][raised]) {
  ...
  @apply(--paper-button-disabled);
  @apply(--paper-button-raised-disabled);
}

[keanulee]

@notwaldorf Would this be considered a breaking change? (If so, something to add to the backlog when we do bump versions.)

[notwaldorf]

Ugh, I'm confused about the spec. The image shows the flat disabled buttons not having a background, but the video below it shows them as having one.

Someone should double check this with @zgibson :)

[notwaldorf]

@keanulee: to answer your question: Depending on what we decide is correct, I would maybe consider this a breaking change, yes.

[anentropic]

I find it bizarre that the raised button 'raises' further when you press on it