Thick lines are not rendered for Mermaid diagram
Description
Meermaid isn't rendered correctly in Gitlab.
Thick arrows don't work
This code:
graph TD
Arrows -->|thin| works
Arrows ==>|thick| fails
should be rendered like this:
Instead it is rendered like this in Gitlab:
graph TD
Arrows -->|thin| works
Arrows ==>|thick| fails
Here is a static image of this gitlab-version of the image instead of a generated one:
As you can see, the thick arrow in gitlab is not thick.
You can see a correct version of the image in the mermaid-live-editor
Note also how the colors are changed.
A reference about how thick arrows should look like in mermaid can be found in the official docs: https://mermaidjs.github.io/
I am using Firefox version 65.0 on macOS (64 bit)
Edited by Mark Fletcher