Dropdown Not Triggering After Typing Characters Following '@' once editor lose focus

[clx174]

Description
The mention dropdown only triggers when '@' is typed. If I type '@joh' and the users are filtered, then click outside the editor, and come back to type 'n' (making '@john'), the dropdown does not reappear. The dropdown should trigger again after typing any character following '@', up to 10 characters.

Steps to Reproduce

1. Type '@' in the editor.
2. Type a few characters (e.g., '@joh') to filter users.
3. Click outside the editor.
4. Click back into the editor and type another character (e.g., 'n' to make '@john').

Expected Behavior
The mention dropdown should re-trigger and filter users after typing any character following '@', up to 10 characters.

Actual Behavior
The mention dropdown does not re-trigger and filter users after typing characters following '@' if the editor loses and regains focus.

Question
Is there a workaround to make this possible or can I expect this feature in future. Thanks.