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Fix diff syntax highlighting
### What does this MR do?
This MR fixes a syntax highlighting issue that that manifested itself when a user tried the following:
```
+aaa
+bbb
ccc
```
However, a regression in 0abe98f0 caused the last line to be put on the second to last line:

Instead of this:

This bug occurred because of some error in the logic of handling new lines in the content. Refactored HTML parser to avoid duplication of newline parsing.
### What are the relevant issue numbers?
Closes #2235
See merge request !1126