Disable lower case keymap in Vim

问题

I want do disable change-to-lowercase key map in Vim. Specifically, the command mentioned here:

Visual select the text, then u for lowercase.

I find out from here that I can add :unmap u to .vimrc, but it will possibly disable undo command, which I don't want.

How can I disable u in visual selection mode?

回答1:

Use <nop>:

xnoremap u <nop>

May also be interested in:

xnoremap U <nop>
nnoremap gu <nop>
nnoremap gU <nop>

For more help see:

:h <Nop>

来源：https://stackoverflow.com/questions/49561572/disable-lower-case-keymap-in-vim