Links: Link in text based blocks breaks when text is pasted inside the link and we add a space

[desaiuditd]

Description

When user pastes a unicode character inside a link in the paragraph block or a list block, and then user types a space, the link breaks.

Step-by-step reproduction instructions

• Create a new post in Gutenberg block editor.
• Add a paragraph block and adds a piece of text.
• Add a link to any part of the text in paragraph block.
• Moves the cursor inside the link.
• Copy a quote character from https://copychar.cc/
• Paste inside the link in the paragraph block.
• Press Spacebar key from keyboard.
• Observe that the link is broken now.

Expected behaviour

Link should not be broken after unicode character is pasted and when user resumes typing inside the link.

Actual behaviour

Link is broken after unicode character is pasted and when user resumes typing inside the link.

Screenshots or screen recording (optional)

WordPress information

• WordPress version: 5.6
• Gutenberg version: 9.8.0
• Are all plugins except Gutenberg deactivated? Yes
• Are you using a default theme (e.g. Twenty Twenty-One)? Yes. Twenty Twenty

Device information

• Device: MacBook Pro (16-inch, 2019)
• Operating system: macOS 10.15.7 (19H114) Catalina
• Browser: Chrome Version 88.0.4324.96 (Official Build) (x86_64)

[gwwar]

This is related to the paste action instead of any special characters. To reproduce:

1. Add a link:

<!-- wp:paragraph -->
<p>Hello <a href="http://google.com" data-type="URL" data-id="http://google.com">this is a test link</a> foo bar</p>
<!-- /wp:paragraph -->

2. Copy some text into the clipboard (in this example its "bar")
3. Paste the text in the middle of the link
4. Add a space

<!-- wp:paragraph -->
<p>Hello <a href="http://google.com" data-type="URL" data-id="http://google.com">this is bar</a> <a href="http://google.com" data-type="URL" data-id="http://google.com">a test link</a> foo bar</p>
<!-- /wp:paragraph -->

Expected: Link is not broken into two links (based on spacebar behavior without pasting)
Actual: Two links are created

[kathrynwp]

I'm still able to replicate this with:

WordPress 6.0.1
Gutenberg 13.8.1 active or inactive
No other plugins active