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InfluxDB
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I can think of a few ways: 1. :h showmode will show --INSERT-- at the bottom when in insert mode. I'm sure you already have this on, but just to be sure. 1. Lightline can be helpful. The default colour scheme makes the entire line blue. 1. My personal favorite is setting :h guicursor. Insert mode cursor is thin, while normal mode cursor is block. Unfortunately, I use neovim so its default and you have to figure out the code portion yourself. 1. Maybe use autocmd (:h InsertEnter, :h InsertLeave) and write enough vimscript until it works. Suggestions include disabling line numbers in insert mode, change entire background colour, you're limited only by the power of vimscript (or Lua for those nvim doods).
You could try a plugin like vim-airline where the indicator is coloured depending on your current mode
Interesting, this works in xterm, but not with alacritty. Found another way to specific colors with RGB hex values that works in both though... \e]12;rgb:0/ff/0\a