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On TUI startup write the CSI sequence that signals to the controlling terminal that Neovim supports the CSI u scheme for encoding modifiers documented in [1]. This is similar to, but distinct from, Vim's usage of the `t_TI` and `t_TE` variables to handle Xterm's `modifyOtherKeys` setting. For a longer explanation on those differences see [2]. Since Neovim uses libtermkey for key input handling, we use the CSI u encoding rather than Xterm's modifyOtherKeys encoding. [1]: http://www.leonerd.org.uk/hacks/fixterms/ [2]: https://invisible-island.net/xterm/modified-keys.html