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- Guard `cj/duplicate-line-or-region' when COMMENT is non-nil but the
current mode has no `comment-start' (e.g. fundamental-mode).
Previously the function silently produced malformed output via
`comment-region'; now it signals a clear `user-error'.
- Factor the `find-file' advice install in external-open.el into
`cj/external-open-install-advice'. Same idempotent shape
(remove-then-add) but the intent is named.
- Add `cj/--validate-decoration-char' in custom-comments.el and
wire it into all six divider / border / box helpers. Rejects
multi-char strings, empty strings, and control characters like
newline/tab that would corrupt subsequent `M-q' flows. Updated
the five nil-decoration ERT tests from `:type 'wrong-type-argument'
(the old crash signal from `string-to-char' on nil) to
`:type 'user-error', since the validator produces a clear
message instead of a deep crash.
- Extract `cj/--require-spell-checker' in flyspell-and-abbrev.el.
Both `cj/flyspell-toggle' and `cj/flyspell-then-abbrev' now call
the shared helper; the checker list lives in
`cj/--spell-checker-executables', so adding nuspell or any other
checker is a one-line edit.
- Preserve trailing newlines in custom-ordering output. Both
`cj/--arrayify' and `cj/--unarrayify' now detect a trailing
newline on the input region and re-append it to the result,
matching the pattern custom-text-enclose.el already uses.
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Implement 5 new comment styles (simple-divider, padded-divider, heavy-box,
unicode-box, block-banner) and refactor 2 existing functions (inline-border,
comment-box) to use interactive/non-interactive pattern for testability.
Add 178 tests across 7 test files with validation for length constraints and
cross-language support. Fix linter warnings for parameter shadowing and
docstring formatting.
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