As the anon user asks in https://www.mediawiki.org/w/index.php?title=Talk:Flow&workflow=050f371f63d1034818d4782bcb077299 ,
"Will there be a way to view the source of someone's comment, for things like viewing code examples where the commenter hasn't put it in <code> tags?
I don't expect just anyone to be able to edit others comments, but being able to see their code would be useful."
In wiki pages, action=edit always shows the source of the page, and if you don't have rights to change it then it switches to a read-only "View source for <e.g. Main Page> ... You can view and copy the source of this page:". When the wiki think you can't edit a page, its [Edit] tab changes to [View source]. But the equivalent action=edit-post for a Flow post simply fails with "Insufficient permission to access the content."
So perhaps Edit in a post's action menu could similarly switch to View source if you don't have rights to edit (geeky "View source" icon TBD).
(In a former life I requested action=view_source for wiki pages in T21681, Brion Vibber shot it down 8-) .)