Syntax highlighting is broken in MR diffs

Summary

Syntax highlighting is broken in MR diffs

Steps to reproduce

  • Go to the User Settings > Preferences
  • Select Monokai color theme
  • Go to any Merge Request
  • Open Changes/Diff tab

What is the current bug behavior?

All lines with changes are shown in default white color theme

What is the expected correct behavior?

All lines with changes must be shown in Monokai color theme, as was set up in Preferences

Relevant logs and/or screenshots

2018-12-17_15-43-40

Output of checks

This bug happens on GitLab.com