fix(textarea): reset value to an empty string

[andesol]

Done

• Allow setting the value to an empty string. Otherwise, the previous value isn't updated.

QA

Storybook

To see rendered examples of all react-components, run:

yarn start

QA in your project

from react-components run:

yarn build
npm pack

Install the resulting tarball in your project with:

yarn add <path-to-tarball>

QA steps

You should be able to replicate this in a simplified example such as the one in the issue (#1068).

Percy steps

No visual change

Fixes

Fixes: #1068

[webteam-app]

Demo

Jenkins

demos.haus

[andesol]

@lorumic Ready!