fix: don't reset search on click within input in multiselect

[Ninfa-Jeon]

Done

• Fixed the issue where if you type in the search box and then click somewhere inside the input to try and edit the text the input gets cleared (PFA)

QA

Pinging @canonical/react-library-maintainers for a review.

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

• Go to the MultiSelect search variant story
• Type something in the search input
• Now, try to click within this input as if to edit the text you just entered
• The search text should not be reset

Details

Before:

multiselect.mov

[huwshimi]

I've simplified this and added a test.

[github-actions]

🎉 This PR is included in version 4.5.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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