A protocol for comprehensive keyboard handling in terminals
There are various problems with the current state of keyboard handling in terminals. They include:
No way to use modifiers other than ctrl and alt
No way to reliably use multiple modifier keys, other than, shift+alt and ctrl+alt.
Many of the existing escape codes used to encode these events are ambiguous with different key presses mapping to the same escape code.
No way to handle different types of keyboard events, such as press, release or repeat
No reliable way to distinguish single Esc key presses from the start of a escape sequence. Currently, client programs use fragile timing related hacks for this, leading to bugs, for example: neovim #2035.
To solve these issues and others, kitty has created a new keyboard protocol, that is backward compatible but allows applications to opt-in to support more advanced usages. The protocol is based on initial work in fixterms, however, it corrects various issues in that proposal.
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