[Bug 1524328] Re: libpng 1.6 support

[LocutusOfBorg]

@ubuntu release team

In Debian deferred/2 queue now there is a refactored libpng16 with
*real* libpng-dev package, and dropped libpng16-dev one.

Since we want to have only one libpng at each time, I don't think it is
a good idea to provide a libpngSONAME-dev package, specially because
people will use it, and make the transition always difficult.

Of course this is out of xenial scope, so I propose:
leave things as is for xenial, without libpng-dev provided or real..
After xenial, sync libpng1.6 from Debian and start the transition before the next Ubuntu Stable.
(the transition in Debian will start probably in a month or so, even if I have no authoritative answer from release team yet, after the package will be accepted in experimental I'll wait for the ack).

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Title:
  libpng 1.6 support

Status in libpng package in Ubuntu:
  Confirmed

Bug description:
  As said, in Debian it is pretty much in place, and I sync'd/merged almost every package in Ubuntu too.
  Would it be possible to have the transition done for Xenial?

  I can fix stuff in Universe, but not in Main (there is not many
  packages there AFAICS)

  this is the debian bug
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650601

  you can start from this message:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650601#691

  thanks!

  Gianfranco
  ----

  Libpng 1.6 has been out for a little while, apparently it has some
  important fixes for pngquant (which is also in Ubuntu).  There are
  comments here that maybe useful:
  https://github.com/pornel/pngquant/blob/master/rwpng.c

  Presumably at some point libpng1.2 will be EOL so we'll need to
  upgrade anyhow!

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