[Bug] Double pager: Go back on single spread page when previous page was displayed as single page will cause the previous page to be displayed as double page

[tts2k]

Device information

• Tachidesk version: (v0.6.3)
• Server Operating System: (Arch Linux)
• Server Desktop Environment: bspwm
• Server JVM version: OpenJDK 18
• Client Operating System: Arch Linux
• Client Web Browser: Firefox 102.0.1

Steps to reproduce

1. Enable Double page mode
2. Open a chapter that has a single spread page with a previous page displayed as single page (like this)
3. Open a spread page (page 4 with the example above).
4. Go back to previous page (page 3)

Expected behavior

Page 3 should be displayed as single page.

Actual behavior

Page 3 was displayed as double page with page 2 instead

Other details

I think this could be a quick fix by keeping track if previous page was a single page when a single spread page is displayed. I can try to fix it with a PR. Nevermind, it's more complicated than I thought. I'll try to play around with it a little bit