A single image causes non stop loading when looping

[bjoernboehnke]

Describe the bug
If a single image is in the array, the looping is active and you try to go to the "next" image which would be the same, the loading spinner shows up and does not stop. You can close the darkbox overlay using ESC and reopen the image.

To Reproduce
Steps to reproduce the behavior:

1. Create a gallery with a single image
2. Enable loopDirection BOTH
3. Open the single image in darkbox overlay (Full-Screen)
4. Click next or use the arrow key

Expected behavior
The same image should be shown since there is only one in the list and looping is active.

Desktop (please complete the following information):

• OS: MacOS
• Browser: Chrome
• Version: 116.0.5845.110 (arm64)

Additional context
No network or console error is shown when this happens