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Previously, we had a start and a done of the calculation printed by
higher-level code, but this got intermixed by progress reporting from an
external solver or the output of autoremove code…
The higherlevel code is now only responsible for instantiating a
progress object of its choosing (if it wants progress after all) and the
rest will be handled by the upgrade code. Either it is used to show the
progress of the external solver or the internal solver will give some
hints about its overall progress. The later isn't really a proper
progress as it will jump forward after each substep, but that is at
least a bit better than before without any progress indication.
Fixes also the 'strange' non-display of this progress line in -q=1, while
all others are shown, which is reflected by all testcase changes.
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Prevents that "old" dependencies have an influence in the scoring.
With positive dependencies this is usually not a problem, but negative
dependencies can linger around for a long time.
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versioned -dev packages like db and boost have the problem of no
dependencies which would give them a competitive advantage against an
older incarnation of the -dev package, so they tend to be kept back
until the old version is removed from the archive, which, if the user
has older releases in its sources can take a long time (or never happens).
The newer version has a conflicts/breaks against the older one, but the
older one hasn't against the newer, so by giving via the conflicts the
older one a reduced score the newer one can win if there is no other
reason to keep it. If both have a conflict against each other the
scoring will cancel itself out, so no harm done.
This gives "action" a slightly bigger edge in breaks/conflicts cases
than before, but holding back isn't a really good solution anyway.
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