Quill removes the entire word when using the space after a word with a link

[stirelli]

Quill removes the entire word when using the space after a word with a link

Steps for Reproduction

1. Visit https://codepen.io/stirelli/pen/GwyWjB
2. Select the word 'links'
3. Set a link
4. Make an space at the end of the word

Expected behavior:
Should make a normal space

Actual behavior:
Quill removes the entire word

Platforms:
Chrome 70.0.3538.77 (Official Build) (64-bit)
Ubuntu 18.10

Version:
v2.0.0-dev.3

[jaredly]

Looks like it only happens when the text is bold.
Additional information:

• if you have some bold text with a link in the middle, putting a space after the link deletes the link & puts the cursor at the end of the bold text.

[krogersforbes]

I confirmed that this also happens when text is in italics or underlined, I believe it's related to having the <a> nested inside of another tag. I traced the actual removal to https://github.com/quilljs/parchment/blob/2.0/src/blot/abstract/parent.ts#L237
inside of parchment, but I don't have enough depth of knowledge at the moment to understand why the problem is occurring.

Checking out the mutations that cause it, it looks like there's quite a lot going on in there for adding a single character. That's pretty much where I'm getting stuck on tracing it though.

[luin]

Fixed in #3807. Feel free to let me know if there is anything missing. Closing...