Trying to edit https://hu.wikipedia.org/wiki/F%C3%A1jl:Momentum_Mozgalom_log%C3%B3.png with the new source editor (with a "show both tabs" setting, syntax highlighting enabled) ends up with this:
which is pretty confusing. (It's made more confusing by the fact that T185184: Invisible text in new wikitext editor after large paste is still happening.) While this layout makes sense for VE, I don't think it does for the source editor. (Also, the loading process is pretty jarring, with the source code flashing in, then flashing out, the the image flashing in instead.)