Steps to reproduce:
First reported by @fireattack at https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)#Shortcuts_(Ctrl+I,_Ctrl+B_etc.)_don't_work_any_more_in_source_code_editor
Note that on Mac it's Cmd+I and Cmd+B.
For me, the boldening/italicizing do not work even with CodeMirror turned off, but interestingly CodeMirror (for a split second!) seems to think it will work. So maybe the issue isn't CodeMirror?
If by CodeMirror you mean syntax highlighting, yeah, the bug (shortcuts don't work) is there regardless; just that Syntax Highlighting will give some weird visuals, like it's trying..
I should also mention these shortcuts don't work on Firefox either, but I think they're simply overridden by Firefox's built-in shortcuts (both ctrl+B and ctrl+I seem to be toggling "bookmark sidebar" on Firefox).
This is odd but does not break any content. It would be a lot of effort for minimal value so Community Tech cannot commit to addressing this ticket.
I think my question is, are these shortcuts supposed to work?
If not, yeah this visual annoyance is very trivial.
Otherwise, I think "broken shortcuts" is a more serious bug and the ticket's subject should be modified to reflect that.
No, Ctrl+B and Ctrl+I are not supposed to have any effect in the 2010 wikitext editor.
In VisualEditor's 2017 wikitext mode, these shortcuts add formatting (e.g., Command-B on a Mac produces '''Bold''').