Bug: Character insertion position/order sometimes wrong

[PatrickNausha]

If you use Alt + Left/Right Arrow keys on MacOS (and presumably Ctrl + Left/Right on Windows) to jump between whole words in the editor, you run into problems.

Repro steps:

1. Go to https://quill-mention.com/
2. Enter arbitrary text into one of the demo inputs
3. Enter a mention
4. Enter more arbitrary text
5. Click text a few words prior to the mention to place the editor caret there
6. Press Alt + Right repeatedly until the caret arrives at the end of the mention
7. Press the H key
8. Press the I key

Expected behavior: The text "hi" is inserted.
Actual behavior: "ih" appears.

There's also a more obscure repro I ran into with my custom styles:

1. Override these styles and set the margin to margin: 0; (to have no margin on mention elements).
2. Enter text ending with a mention, e.g. "Hi there, @Mickey Dooley"
3. Click to place the caret at the start of the string.
4. Click to place the caret at the end of the string.
5. Type "hi" and see it appear as "ih"

[PatrickNausha]

I'm not sure if this is at all related, but it seems Quill has historically had problems with caret placement with Embed blots (quill-mention uses embed blots). For example,

• Cursor positioned at the end of the line when last blot on the line is an embed. slab/quill#1181
• Inability to type next to or past custom Embed blot (with contenteditable=false) slab/quill#1172

[manacy-keyvalue]

I'm facing the same issue in my nextjs app router based project. Please suggest how to fix this issue.