When replying comments, the text box isn't focused

What does this MR do and why?

When replying on a comment in an issue or an MR, the textbox isn't focused. This bug only happens in a particular scenario.

See #403593 (closed)

Screenshots or screen recordings

Before	After
Screen_Recording_2023-03-31_at_10.15.48	Screen_Recording_2023-03-31_at_10.39.04

How to set up and validate locally

See steps to reproduce in the bug report: #403593 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #403593 (closed)