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Tab completion crashes with "wopt_index is out of range" #12078

@Rua

Description

@Rua

Tab completion causes Fish to crash:

$ (type part of command, press tab)
thread 'main' panicked at src/wgetopt.rs:183:9:
wopt_index is out of range
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: fish::text_face::parse_text_face_and_options
   3: fish::text_face::parse_text_face
   4: fish::highlight::highlight::HighlightColorResolver::resolve_spec_uncached::{{closure}}
   5: fish::highlight::highlight::HighlightColorResolver::resolve_spec
   6: fish::screen::Screen::write
   7: fish::reader::reader::Reader::paint_layout
   8: fish::reader::reader::Reader::handle_char_event
   9: fish::reader::reader::Reader::readline
  10: fish::reader::reader::reader_read
  11: fish::throwing_main
  12: fish::panic::panic_handler
  13: fish::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
fish crashed, please report a bug. Debug PID 4772 or press Enter to exit

Fish version: 4.2.1
Terminal: Konsole 25.08.3
OS: NixOS unstable
Using NixOS' command-not-found, starship

Running sh -c 'env HOME=$(mktemp -d) XDG_CONFIG_HOME= XDG_DATA_DIRS= fish' makes the problem go away, so it may have something to do with an external component interfacing with Fish. But I don't know where the problem lies or how to find it.

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