Module edit_problems 

Every problem an editor round trip can leave behind, and the repair tix can apply to each one (tix #1506).

The old flow ended with a run_editor that re-parsed the temp copy and threw the diagnostic away, so the caller could only report file not valid after edit and the real parse error never reached the user. This module is the replacement: run_editor no longer validates (its job is to run the editor), and the callers classify what came back here, where each problem carries the diagnostic and — where tix can do so safely — a machine-applicable fix.

The taxonomy is deliberately small and closed:

kind	source	automatic fix
history_not_first	a tix lint history finding	move the section to the top of the body
unknown_key	a tix lint unknown_key finding	declare the key in [custom_attributes]
duplicate_key	a YAML duplicate-field parse error	drop the later duplicate, keep the first
retired_links_key	a tix lint retired_links_key finding	remove the key
missing_title	an empty title: after the edit	restore the pre-edit title
history_entry	a hand-edited ## History line	none — reopen the editor
invalid_value	any other tix lint finding	none — reopen the editor
unparsable	a frontmatter that will not parse	none — reopen the editor

Every problem carries a proposal, even when the only honest proposal is “reopen the editor on the retained copy and fix it by hand”. A problem with no proposal would be a dead end, which is exactly what this ticket exists to remove.

Structs

EditProblem

One classified problem, with the diagnostic and the way out.

Enums

EditFix

A machine-applicable repair.

EditProblemKind

What kind of post-edit problem this is.

Functions

for_lint_findings

Classify the findings of a tix lint pass over the edited file.

for_parse_error

Classify a failed Issue::parse.

missing_title

A titleless issue’s problem, with the pre-edit title as the fix when there is one to restore.