Steps to reproduce:
- Go to Administer Wiki > Look & Feel > Lightbox and enable it
- Create a page and add a image to it
- In view move, hove the image
- After the popover is displayed go diagonally towards it, to click for example on the `anchor` button
The popover remains displayed and you can click on the anchor.
The popover disappears.
Only when going straight down, using the arrow as 'path', the popover remains displayed. See the screenshot
XWIKI-19754 LightboxIT#navigateThroughImages is flickering