Recently I changed my CtrlP settings like below, and I found this ctrlp_mruf_relative option doesn't take into effect under mixed mode.
let g:ctrlp_cmd = 'CtrlPMixed'
let g:ctrlp_mruf_relative = 1
Could you please check it out if it is not an intended behavior?
Yes, it's intended, or was intended. If the option does take effect in Mixed mode then in most cases, it'll effectively remove all MRU files in the mix. But now that I see some people might actually want that, I think I'll enable it.
Thanks for reconsidering this, Kien!
Fix `ctrlp_mruf_relative` doesn't work under mixed
Apply mruf_relative to the raw list