https://bugzilla.wikimedia.org/show_bug.cgi?id=23205

           Summary: pre-save transform may occur outside section being
                    edited
           Product: MediaWiki
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: Page editing
        AssignedTo: wikibugs-l@lists.wikimedia.org
        ReportedBy: m8r-cyc...@mailinator.com


I noticed the pre-save transform affects the entire
page, not just the section you are editing. If through
some trickery or foresight you create a page like this:

> ==Section 1==
> {{subst:template which doesn't exist yet}}
> {{subst:#some future parser-func:foo|bar}}
>
> ==Section 2==
> Lorem ipsum

A subsequent edit to Section 2 may cause unexpected
changes to the wiki-text of Section 1 if and when the
requested subst-items exist.

Seems like the least astonishing behavior would be to
prevent this.

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