Needed by the execrable ncurses. Adds an extra branch in the hot path,
sigh. Thanks to branch prediction it doesnt have any measurable impact
on the benchmark, thankfully.
While kitty is never going to underline detected URLs as the performance
of that is absurd, underlining hyperlinks specifically is acceptable,
since they dont require detection.
See #6766
Fix the problem caused by wrong cursor coordinates. No more messing with
the main cursor, instead the cursor is saved when receiving a pre-edit
text update and used for drawing later.
Update the overlay to the last visible cursor position before rendering
to ensure it always moves with the cursor. Finally, draw the overlay
after line rendering is complete, and restore the line buffer after
updating the rendered data to ensure that the line text being read is
correct at all times.
This also improves performance by only rendering once when changes are
made, eliminating the need to repeatedly disable and draw after various
commands and not even comprehensively.
Correctly update the overlay position when cursor visibility changes.
Restore the overlay line only when the cursor is visible.
Clear the saved overlay when drawing new pre-edit text.
Also update the cursor position when screen size changes.
Use four spaces to indent instead of two.
Fixing this involved adding a new mode to kitty where it handles
ctrl-c/z/q by sending signals to the tty foreground process group
instead of delegating to the kernel to do that. Since the pipe may be
full we have no way of knowing when the kernel will get around to
reading the signal byte. So send the signal ourselves.
Fixes#5271
Can be used with shell integration to give more accurate
cwd detection and also combined with the ssh kitten
to magically open new windows connected to remote servers
at the correct cwd on the remote server instantly.
Since we are only sending the last command, it cannot have CSI
sequences in it anyway except in extremely contrived situations, so just
strip all ctrl chars out.
