Bug#916195: python3-qwt: make optional the python3-pyqt4 dependency

[Dmitry Shachnev]

Control: severity -1 serious

On Tue, Dec 11, 2018 at 10:42:00AM +0100, Marc Josep Rosanes Siscart wrote:
> When installing python3-qwt from Debian stretch (using apt-get install),
> python3-pyqt4 is also installed, even if python3-pyqt5 is available.
>
> After testing python3-qwt with python3-pyqt5 and a dummy/mock package of
> python3-pyqt4 (allowing to bypass the dependency on it), the impression is
> that python3-qwt is working well with python3-pyqt5.
>
> The dependency on python3-pyqt4 should be made optional. 
> If python3-pyqt5 is already installed in the system, python3-pyqt4 should
> not be installed.

I am bumping the severity to release critical as we want to remove Qt 4 from
Bullseye, as previously announced in:

https://lists.debian.org/debian-devel-announce/2017/08/msg00006.html

--
Dmitry Shachnev
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