Button - kind and disabled button doesn't apply when hover and plain

Expected Behavior

disabled styles should apply when hoverindicator or plain is set on a grommet button.

Actual Behavior

No disabled styles applied.

URL, screen shot, or Codepen exhibiting the issue

Use this code when using the kind button, and see how disabled styles don’t apply.

<Button
          label="Disabled"
          disabled
          hoverIndicator
          plain
          icon={<FormNext />}
        />

Related to https://github.com/grommet/grommet-theme-hpe/pull/110

Steps to Reproduce

Your Environment

• Grommet version: 2.15.0
• Browser Name and version:
• Operating System and version (desktop or mobile):

[ShimiSun]

I think we have implemented all possible action items for this issue as linked to the PRs above. With button kind, users can define disabled text color, border color, etc but plain will only look at the disabled opacity value props.theme.button.disabled.opacity. The issue we experienced with the HPE theme, is that the opacity is set to 1.0 so you don’t see any drop in opacity on disabled + kind + plain Button. But, if any other theme relied on the grommet default opacity (0.3) or defined their own (as long as it’s not 1.0) then the disabled opacity would give a visual effect of “disabled”. In the case of HPE theme users, it will be recommended not to use plain buttons.

[ShimiSun]

@leonardodino thanks buddy, from what I’ve seen, Button + plain + disabled + kind (kind is when button.default is defined on the theme), the plain button doesn’t get the text opacity or the text-weak property, so the Button disabled text isn’t reflecting the disabled property well.