The change in behavior depends on what the user wants. Basically, it
comes down to this: does the user want EasyEffects with the enhancements
provided by calf-plugins and broken Ardour/Audacity (or others perhaps?)
or do they want to be able to remove calf-plugins and still have a
functioning EasyEffects minus those enhancements?

Additionally, and one reason why I got lsp-plugins packaged in Ubuntu
(and then it was undertaken by Debian so long ago) was because calf-
plugins development had stalled as it depends on GTK-2, which in turn
causes errors in Ardour. lsp-plugins takes the place of a lot of calf-
plugins in functionality and may have surpassed by now

These plugins function in such a way that their code becomes part of the
code of the host program, so if the host program has a conflicting
toolkit, it tends to crash. EasyEffects does not expose the plugins'
native interface to the user, thus avoiding those issues. However,
Ardour and Audacity do, which causes them to break when testing the
plugins for functionality during an initial scan.

The recommendation in the Debian bug report is to drop calf-plugins to a
recommends, but I took it a step further by making it a recommends if
lsp-plugins is not already installed. This should make it auto-
uninstalable on machines that already have it installed. If a user wants
those enhancements again, it's simple to reinstall.

So far, I have had no objections in the Debian package. One thing I'd
note, though, is that within easyeffects, lsp-plugins and calf-plugins
do duplicate each others' capabilities, which is why I'd think having
one or the other as a recommends would be ideal.

The reason easyeffects had calf-plugins as a Depends was merely due to
leftovers from PulseEffects, its predecessor, which required calf-
plugins as a hard dependency in order to even function. However,
PipeWire doesn't require that as it has built-in filters, but having the
plugins serves as an enhancement.

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https://bugs.launchpad.net/bugs/2063879

Title:
  [SRU] EasyEffects Depends: calf-plugins should be Recommends

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