Less version 633

Version 633 was released for general use on 3 May 2023.

These are the differences between version 608 and version 633:

• Add LESSUTFCHARDEF environment variable (github #275).
• Add # command (github #330).
• Add ^S search modifier (github #196).
• Add --wordwrap option (github #113).
• Add --no-vbell option (github #304).
• Add --no-search-headers option (github #44).
• Add --modelines option (github #89).
• Add --intr option (github #224).
• Add --proc-backspace, --proc-tab and --proc-return options (github #335).
• Add --show-preproc-errors option (github #258).
• Add LESS_LINES and LESS_COLUMNS environment variables (github #84).
• Add LESS_DATA_DELAY environment variable (github #337).
• Allow empty "lines" field in --header option.
• Update Unicode tables.
• Improve ability of ^X to interrupt F command (github #49).
• Status column (-J) shows off-screen matches.
• Parenthesized sub-patterns in searches are colored with unique colors, if supported by the regular expression library (github #196).
• Don't allow opening a tty as file input unless -f is set (github #309).
• Don't require newline input after +&... option (github #339).
• Fix incorrect handling of some Private Use Unicode characters.
• Fix ANSI color bug when overstriking with colored chars (github #276).
• Fix compiler const warning (github #279).
• Fix signal race in iread (github #280).
• Fix reading procfs files on Linux (github #282).
• Fix --ignore-case with ctrl-R (no regex) search (github #300).
• Fix bug doing repeat search after setting & filter (github #299).
• Fix bug doing repeat search before non-repeat search.
• Fix crash with -R and certain line lengths (github #338).
• Fix input of Windows dead keys (github #352).
• Don't retain search options from a cancelled search (github #302).
• Don't call realpath on fake filenames like "-" (github #289).
• Implement lesstest test suite.
• Convert function parameter definitions from K&R to C89 (github #316).