Enable color palettes with custom color alpha support

[niklasp]

Description

<ColorPicker> component already had alpha support. Added a disableAlpha prop to the <ColorPalette> that passes the prop to the <ColorPicker>. Fix #27960 Fix #13045

How has this been tested?

Tested with a custom Block that has a <ColorPalette> in its inspector controls and disableAlpha={ false }. Also tested core components that have <ColorPalette> still work.

Types of changes

New feature (non-breaking change which adds functionality)

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

[Mamaduka]

The change looks good to me.

It looks like checks failed because of the Docker registry, so I restarted them.

Update: I just came across this comment from a previous PR that tried to add this feature.

Based on it, this PR might not be complete.

[niklasp]

I see that there might be the need for discussion. I could oc write Story and change the doc as well. Other than the PR you posted I just decided an rgba color format. But I do not see where this might be a problem?

Also could you forward the issue to someone who could decide that or open the descussion? Since css 4 spec we could also use 8 digit hex codes including alpha information.

[niklasp]

Also to add to the discussion. The colorpicker does the same afaik, return hex values when alpha is disabled and rgba when it is enabled. https://wordpress.github.io/gutenberg/?path=/story/components-colorpicker--alpha-enabled. @youknowriad what is your opinion on this?

[youknowriad]

Also to add to the discussion. The colorpicker does the same afaik, return hex values when alpha is disabled and rgba when it is enabled. https://wordpress.github.io/gutenberg/?path=/story/components-colorpicker--alpha-enabled. @youknowriad what is your opinion on this?

I think that's fine though we might want to document the prop and the behavior properly on the README of the component.

[niklasp]

@Mamaduka added storybook example and doc. Tests succeed.

[niklasp]

@ajitbohra @chrisvanpatten ?

[niklasp]

Still waiting for this to be merged, is there a reason why it is still pending reviews? @ajitbohra @chrisvanpatten?

[lukecarbis]

I'm waiting for this to be merged also.