Bug: only deleting characters shows wrong preview when mouse moves outside text area

[whyboris]

1. Add files to rename
2. Delete some characters from a filename
3. Move your mouse outside the text area
4. ❌ notice the old filename show up in the preview area (text area)
5. Add any characters to a filename
6. Move your mouse outside the text area
7. ✅ text area shows correct preview of the filename

[whyboris]

🤔 I suspect this is because of Angular updating its change-detection algorithm; maybe detectChanges() will be a sufficient fix 🥳 🤞

[whyboris]

Duplicate: #80