Highlight decoration at the highlight blocks with notes
First of all, this is not a bug report, but a feature request.
Thanks to the Evince team that provides the possibility to add custom notes to those highlight blocks by just clicking the color block and editing. However, if keeping all notes closed and reopening the annotated file after a long time, it's quite hard to trace which highlight block contains custom notes.
I think it would be great to add a small decoration on those highlight blocks with notes, just to easily distinguish highlights with and without notes by a glance. I leave an example with a red surrounding box as below. I'm quite open to any decoration look, but it should be automatically triggered by adding notes to a highlight block.