Draft: User can now highlight with multiple colours, and annotate with underline, strikeout, and squiggly.
The user can now annotate PDF documents with multiple highlighting colours and can also add underlining, strikeout, and squigglies.
There are also icons that are associated with each annotation function. These icons were personally designed in 2016 and have elements that are only copied from existing GNOME icons. NOTE: Please let me know if it needs redesigning.
These additions allow better versatility for users in annotating PDF documents.