Color picker: No easy way to get back to HEX color after changing alpha channel from 1

[gregwolanski]

Illustration of the problem:

Proposed solution:

• Save somewhere the alpha channel setting.

• Allow HEX conversion with the alpha channel set to 1.

[orangemug]

We could also just disable HEX in the colour picker unless you manually type it in the <input>

[orangemug]

There is an issue raised in the react-color repo, see casesandberg/react-color#510

[pathmapper]

The issue mentioned by @orangemug in the react-color repo was closed with

We are changing the way hex colors are handled in the new version and this will no longer be an issue.