Reading pane flashes previous email when switching from empty folder to another empty folder

## Prerequisites
- [x] I have searched open and closed issues for duplicates.

## Describe the bug

Reading pane flashes a previously read email when switching from empty folder to another empty folder.

### To Reproduce
Steps to reproduce the behavior:
1. Open any email
2. Click on an empty folder
3. Click on another empty folder
4. A previously read email is flashed for a brief moment

### Expected behavior

The reading pane consistently shows "No conversations in folder"

### Screenshots or screen recordings

Happy to provide one if needed.

## Platform Information


- [x] I'm using the latest version from git that I've manually compiled
- [x] I'm using the latest released stable version

_tried both_