与 Vim 终端相关的一些修复配置

[roccomao]

1. 终端 Vim 改变光标在不同模式下的样式

   • Reference: Change cursor shape in different modes
   • Vim Help: :h termcap-cursor-shape

   let &t_SI = "\<Esc>[5 q"
   let &t_SR = "\<Esc>[3 q"
   let &t_EI = "\<Esc>[1 q"
   
   "  1 -> blinking block
   "  2 -> solid block
   "  3 -> blinking underscore
   "  4 -> solid underscore
   "  5 -> blinking vertical bar
   "  6 -> solid vertical bar

2. 出现类似>4;m、>4;2m的异常字符

   • Reference: What's t_TE and t_TI added by vim 8?
   • TL;DR Solution: disable the modifyOtherKeys feature
   • Vim Help: :h map.txt & :h modifyOtherKeys

   let &t_TI = ""
   let &t_TE = ""

3. Vim 支持终端真彩，但可能需要一些额外配置

   • Reference: termguicolors doesn't work in terminal Vim
   • Vim Help: :h term.txt & :h xterm-true-color & :h tmux-integration

   let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
   let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
   set termguicolors