Description

Steps:

• open new issue editor (or PR)

Closes #445
Closes #446

• then slowly press backspace until you remove #
  
• see error

Uncaught (in promise) DOMException: Index or size is negative or greater than the allowed amount
    $l index.js:431
    getBoundingClientRect index.js:393
    positionMenu index.js:490
    activate index.js:483
    onInput index.js:575

Gitea Version

1.24.0+dev-218-g7da8a01d39

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

No response

How are you running Gitea?

docker

Database

None