Restore thumbnail preferred size

[cardsurf]

System specification Linux Mint 19.0 Cinnamon 3.8.7

Issue description When thumbnails does not fully fit on a screen they are shrank. After closing most of the thumbnails so the remaining ones can fit on the screen the thumbnails size remains shrank.

Steps to reproduce

1. Open one thumbnail. The thumbnail size is set to preferred value.
2. Open more thumbnails than can fully fit on the screen. The thumbnail size is shrank.
3. Close all of the thumbnails except one.
4. Open the remaining thumbnail. The thumbnail size is not set to preferred size.

Current result Thumbnail size remains sharnk.

Expected result Thumbnail size is restored to preferred size.

[cardsurf]

I have opened a pull request in cinnamon species repository as recommended in readme: https://github.com/linuxmint/cinnamon-spices-applets/pull/1885 Any feedback is greatly appreciated.

[jaszhix]

Fixed in v6.3.9

[cardsurf]

I have updated the applet to the newest version and the issue is fixed. Good job.