Dear Maintainer,

Consider this watchfile:

version=3
# Search the version number on this page
https://download.qt.io/development_releases/qt/6.7/
# Then use downloadurlmangle to transform it to the URL to the archive.
#
# We don't use repacksuffix=+ds because in salsa-ci we want to have the +ds
suffix, even if we use --no-exclusion (ie even if we ignore Files-Excluded)
#
opts="uversionmangle=s/(\d)[_\.\-\+]?((RC|rc|pre|dev|beta|alpha)\d*)$/$1~$2/,
\
 dversionmangle=s/@DEB_EXT@//, \
 oversionmangle=s/$/\+ds.1/, \
downloadurlmangle=s/\/([\d\.]*(-((RC|rc|pre|dev|beta|alpha)\d*))?)\/$/\/$1\/
single\/qt-
everywhere-src-$1\.tar\.xz/, \
 filenamemangle=s/.*\/([\d\.]*(-((RC|rc|pre|dev|beta|alpha)\d*))?)\/$/qt-
everywhere-src-$1\.tar\.xz/" \
https://download.qt.io/development_releases/qt/6\.(?:[\d\.]*)/ ([\d\.]*-.*)/
debian bash debian/scripts/repack.sh



Lintian will output:

debian-watch-not-mangling-version
opts="uversionmangle=s/(\d)[_\.\-\+]?((RC|rc|pre|dev|beta|alpha)\d*)$/$1~$2/,
dversionmangle=s/@DEB_EXT@//, oversionmangle=s/$/\+ds.1/,
downloadurlmangle=s/\/([\d\.]*(-((RC|rc|pre|dev|beta|alpha)\d*))?)\/$/\/$1\/
single\/qt-
everywhere-src-$1\.tar\.xz/,
filenamemangle=s/.*\/([\d\.]*(-((RC|rc|pre|dev|beta|alpha)\d*))?)\/$/qt-
everywhere-src-$1\.tar\.xz/"
https://download.qt.io/development_releases/qt/6\.(?:[\d\.]*)/ ([\d\.]*-.*)/
debian bash debian/scripts/repack.sh [debian/watch:12]


I suspect this is because lintian considers that @DEB_EXT@ is only valid for a
watchfile version >= 4 (see $DMANGLES_AUTOMATICALLY variable), but according
to
source code in uscan, it seems it requires version >= 2.


BTW, I noticed that:
- if I use version=4 with @DEB_EXT@, the lintian warning is gone
- if I use version=3 + dversionmangle=auto, the lintian warning is gone as
well.

But version=3 with @DEB_EXT@ triggers the warning.

I'm attaching a patch without being sure that it is the correct way to fix the
issue, but when it is applied lintian doesn't report a warning.