Fix multi-line syntax highlighting
What does this MR do?
This MR fixes multi-line syntax highlighting in the code views. HTML span elements only apply to a single line, and in the case of multi-line comments, the highlighting was dropped as a result. Ensure that each line has the proper styling to fix this.
Why was this MR needed?
The current styling was broken for a while.
Screenshots
Before:
After:
What are the relevant issue numbers?
Closes #1577 (closed) Closes #1495 (closed)