[Izkata]

vim (7.4) seems to display them by default. With my whole vimrc commented out (just to be sure it wasn't a setting I changed), I get this:

    F<200b>or exam<200b>ple, I’ve ins<200b>erted 10 ze<200b>ro-width spa<200b>ces in<200b>to thi<200b>s sentence, c<200b>an you tel<200b><200b>l?

(The <200b> is also highlighted a different color than the rest of the text, and acts like a single character when moving the cursor through it. It's really, really obvious.)

[plesn]

Indeed, I copy-pasted in emacs but not in vim, my bad...