url_savename truncated any trailing ".token" when applying a resolved
content-type, so /article-1.884291 served as text/html was saved as
article-1.html, dropping the .884291 tail and colliding with every
sibling sharing the prefix. Cut the old extension only when it is the
resolved type, a known MIME extension, a dynamic-page extension, or an
html-family extension; otherwise keep the tail and append the type
(article-1.884291.html).
Recognized extensions still collapse as before, so the #267/#408
soft-404 behavior (a binary URL served as HTML named .html) is
preserved, and a type that agrees with the extension causes no churn.
Add a hidden -#N <fil> <content-type> self-test driving url_savename
offline, plus tests/01_engine-savename.test covering the matrix.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Xavier Roche <roche@httrack.com>
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