This enables shifted alt-prefixed keys, such as `shift+alt+.` on
US standard becoming `M->`. To do this, we needed to fix a few bugs:
(1) translation mods should strip alt even if other mods are set
(2) AppKit translation event needs to construct new characters with
the translation mods.
(3) Alt-prefix handling in KeyEncoder needs to allow ASCII utf8
translations even for macOS.
Fixes#872
In #867 we fixed macos-option-as-alt, but unfortunately AppKit ALSO does
some translation so some behaviors were not working correctly.
Specifically, when you had macos-option-as-alt set, option+e would
properly send `esc+e` to the pty but it would ALSO set the dead key
state for "`" since AppKit was still translating the option key.
This commit introduces a function to strip alt when necessary from the
translation modifiers used at the AppKit layer, preventing this
behavior.
Fixes#619
This changes the behavior from requiring printable text to any input
that isn't a modifier and also generates some data we send to the pty.
If there is printable text, we also clear the selection.
Fix reporting of alternate keys when using the kitty protocol. Alternate
keyboard layouts were failing to report the "base layout" key. This
implementation now matches kitty's output 1:1, and has some added unit
tests for cyrillic characters.
This also fixes a bug where a caps_lock modified key would report the
shifted key as well. The protocol explicitly requires that shifted keys
are only reported if the shift modifier is true.
This reverts commit c139279d479682c17f63d9b57c2d56608d09d16a, reversing
changes made to 4ed21047a734d7c586debe0026e3b6ea90ed1622.
We do want to do this but this broke bindings.
