.vim: sort tabs/spaces-related lines in ftplugin/*.vim

.vim: use setlocal in autocmd for setting list and spell (both window-local)

apt.conf.d: merge all separate files into one, add comments

.vimrc: default to pyflakes3 and python3

.vimrc: try ctrlp's tag search (in all open buffers) Requires exuberant_ctags or a compatible program (I have universal-ctags).

.vimrc: one day vimscript will let us have spaces around operators everywhere Today we prepare for that day, for it will come. I might've looked at https://favadi.com/update-your-vimrc-to-vim9-script/

.vimrc: copy neovim's cursor changes in insert and replace modes

.vimrc: recognize numbered lists when formatting Example: https://vimways.org/2018/formatting-lists-with-vim/

.vimrc: set updatetime from 4000ms to 500ms This matters for certain async plugins, such as signify, that use CursorHold autocommand event. Signify recommends going as low as 100, but 500 should be good enough.

.vimrc: comment for colorcolumn