Image diff discussion markers are broken on commits

Summary

Comments made on an image don't display markers properly on commits

Steps to reproduce

  • go to any commit with an image
  • leave a comment on the image

Example Project

https://gitlab.com/reproduction-group/image-discussions/commit/0704ed41d80944bb7d28acffe7d82ce6d11d0cd0

What is the current bug behavior?

marker styling is broken:

Screen_Shot_2018-12-04_at_12.22.57

What is the expected correct behavior?

styling looks as in merge requests:

Screen_Shot_2018-12-04_at_12.24.28

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