fix(tui): set cursor color param as string when required #21407

Problem:
See #20628. Terminals supporting cursor color changing usually set the
"user-defined" `Cs` terminfo capability. Most terminals expect the parameter to
the capability to be a string (in hex format like `#0099ff` or like
`rgb:00/99/ff`), others may expect a number.

Nvim currently can't handle string parameters, causing terminals to receive
a bogus command.

Unfortunately, as the `Cs` capability is "user-defined", there's no strict
format. The parameter it takes isn't really standardized. It seems most
terminals in use follow xterm; iTerm appears to be an exception.

Solution:
Use the `Cs` capability more reliable by following terminfo and
sending the color in hex format, at the cost of using unibilium string vars.
Alternatively, could revert https://github.com/neovim/neovim/commit/34d41baf8a8e4ab8c006b7f29a8106e60e311aa2
and hardcode the specific format required by terminals, instead of reading
terminfo.

Fixes #20628
Fixes #19607

0 files changed, 0 insertions, 0 deletions