Fixes#1403
This changes the behavior of `grapheme-width-method = unicode` to change
the default state of mode 2027 to true. Prior to this, setting this
config would force grapheme clustering regardless of mode 2027. Now,
this only sets the default and running TUI programs can disable it if
they want.
Fixes#1416
At a high level, the issue is that when mouse capture is enabled (i.e. in
neovim), "shift" escapes the capture. So "cmd+shift" is equal to "cmd"
which doesn't get sent to the TUI program and so on. For link
highlighting which now requires "cmd" (super) is held, we were sending
"cmd+shift" to the renderer so we weren't checking for links.
So the core of this commit is respecting this scenario and stripping the
shift modifier.
This commit also found that when the mouse wasn't over a link, we were
always checking and highlighting links on line one of the visible
screen. This bug is fixed and should also result in a very slight
performance improvement on rendering in all cases.
Fixes#1401
SCOSC is ambiguous with regards to DECSLRM. This commit copies the logic
of xterm: if left/right mode is enabled, then CSI S is always DECSLRM.
But if left/right mode is disabled then CSI S empty always uses SCOSC.
SCORC always works.
Normally, when `ctrl+<character>` is pressed, such as `ctrl+z` or
`ctrl+c`, macOS (AppKit) doesn't do any key translation because that
doesn't map to any printable text on its own. Ghostty does the
translation to correctly determine the character is "z" or "c" or
whatever.
For some reason when the keyboard layout is "Dvorak - QWERTY Cmd"
specifically (_not_ plain "Dvorak") on a US layout keyboard, AppKit
decides that "ctrl+z" ("/" on a qwerty keyboard) translates to "/"...
I can't find any explanation for this.
To workaround this, this commit makes it so that if the following
conditions are true, then we IGNORE AppKit's text translation and
manually do it using UCKeyTranslate:
(1) We're on macOS specifically (not iOS, etc.)
(2) We have a key event with ONLY control pressed
This fixes `ctrl+z` on this unique Dvorak keyboard layout.
