sds / haml-lint / 27999763738

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Add auto-correction to HAML-level linters (#649)

* Add autocorrect infrastructure to the Linter base

Add the building blocks that let HAML-level linters rewrite the source:
- autocorrect? gate, apply_autocorrect, autocorrected_lines/correct_line and an
  after_visit_root flush, all routing through Document#change_source.
- autocorrect_safe/autocorrect_safe? so unsafe corrections only run under -A.
- autocorrect_priority + Runner sorting so order-dependent fixes run in order.
- reset_autocorrect_state so reused linter instances don't leak corrections
  between files.

* Add autocorrect to ClassAttributeWithStaticValue

Rewrite a sole static \`class:\` hash entry to the `.class` shorthand,
guarding against multi-pair hashes, multiline sources and duplicate classes.

* Add autocorrect to ClassesBeforeIds

Reorder the .class/#id attribute components to the configured order.

* Add autocorrect to ConsecutiveComments

Merge consecutive `-#` comments into one block. Marked unsafe, so it only
runs under --auto-correct-all.

* Add autocorrect to EmptyObjectReference

Strip the empty `[]` object reference from the tag.

* Add autocorrect to EmptyScript

Delete childless empty - scripts, tracking deleted lines in per-run state
that is reset between files. Marked unsafe.

* Add autocorrect to FinalNewline

Normalize the single trailing newline. Runs last (autocorrect_priority 1)
so line-level fixes from other linters land before the newline is settled.

* Add autocorrect to ImplicitDiv

Drop the redundant %div before a .class/#id shorthand.

* Add autocorrect to LeadingCommentSpace

Insert the missing space after the `#` in comments.

* Add autocorrect to MultilineScript

Merge a trailing-operator script with the next sibling line, accumulating
merges in per-run state reset between files. Marked unsafe.

* Add autocorrect to RubyComments

Rewrite `- #` comments to `-#`.

* Add autocorrect to SpaceBeforeScript

Insert the missing space after =/- script markers (... (continued)

265 of 267 new or added lines in 18 files covered. (99.25%)

3008 of 3089 relevant lines covered (97.38%)

30814.42 hits per line