Underscore character cannot be entered

[mj-2017]

I am using CtrlP v1.80 with vim8.2-940 on Linux (RHEL6.8). I recently updated from vim8.1 . A new issue popped up with vim8.2-940: I can no longer enter an underscore character at the CtrlP prompt. All other chars seems to be fine, but when I try to type '_' nothing is inserted appended on the search string.

I cleared my .vimrc off all entries except those to load/configure CtrlP, and the problem still occurred. Furthermore, nothhing has changed in the CtrlP related lines in my .vimrc .

[kting28]

I have the same issue , I traced the problem to somewhere between 8.2 patch 566 and 775:
Included patches: 1-566 : underscore works in gvim ctrlp prompt
Included patches: 1-775 : underscore does not work in gvim ctrlp prompt
This issue only happens in gvim, not console vim.

[sanjaypatelic]

I noticed that the issue can be fixed by setting g:ctrlp_key_loop=1 to enable multi byte characters.
However, it will take away g:ctrlp_lazy_update from you!!

[trou]

Hi, I found this issue when trying to enter digits on my AZERTY keyboard (which requires shift).
Using the let g:ctrlp_key_loop=1 trick makes it work.