Mermaid doesn't work with Copy-as-GFM
Description
!15107 (merged) introduced support of mermaid.
Mermaid diagrams consist of SVG elements.
But right now a user can't just select diagrams, copy them, paste in a textarea, and get that diagram as a code block.
Proposal
Add support of mermaid to app/assets/javascripts/copy_as_gfm.js
Edited by Douwe Maan