For a less repetitive package menu (was: Improving browsing and discoverability in the Packages Menu)

[Artur Malabarba]

Those of you who use the `package-archive-priorities' variable may
have noticed the package-menu is a little less repetitive, so I
figured I owed an explanation. This is because of a new
variable/functionality: `package-menu-hide-low-priority'.

In short, if a package is available on multiple archives and one has
higher priority (as per `package-archive-priorities') only that one is
listed.

The main use of this is that the user who has both Melpa and
Melpa-stable configured can hide the Melpa packages where a Stable
version is also available (despite being lower version) by configuring
the priorities:

(add-to-list 'package-archive-priorities '("melpa-stable" . 10))

The variable also can be configured to additionally hide a
lower-version package if both archives have the same priority.


Cheers