Bug#999533: matplotlib: python3-pil.imagetk should be Depends

[Sebastiaan Couwenberg]

reopen 999533
reassign 999533 matplotlib 3.5.0-1
retitle 999533 matplotlib: python3-pil.imagetk should be Depends
affects 999533 src:python-cartopy src:topplot src:aplpy
affects 999533 src:python-ltfatpy src:python-bayespy
affects 999533 src:python-matplotlib-venn
tags 999533 patch
thanks

On Fri, 12 Nov 2021 21:33:15 +0100 Sebastiaan Couwenberg wrote:
> On 11/12/21 08:19, Lucas Nussbaum wrote:
> >> cartopy/tests/mpl/__init__.py:15: in <module>
> >>      import matplotlib.pyplot as plt
> >> /usr/lib/python3/dist-packages/matplotlib/pyplot.py:2226: in <module>
> >>      switch_backend(rcParams["backend"])
> >> /usr/lib/python3/dist-packages/matplotlib/pyplot.py:267: in switch_backend
> >>      class backend_mod(matplotlib.backend_bases._Backend):
> >> /usr/lib/python3/dist-packages/matplotlib/pyplot.py:268: in backend_mod
> >>      locals().update(vars(importlib.import_module(backend_name)))
> >> /usr/lib/python3.9/importlib/__init__.py:127: in import_module
> >>      return _bootstrap._gcd_import(name[level:], package, level)
> >> /usr/lib/python3/dist-packages/matplotlib/backends/backend_tkagg.py:1: in <module>
> >>      from . import _backend_tk
> >> /usr/lib/python3/dist-packages/matplotlib/backends/_backend_tk.py:14: in <module>
> >>      from PIL import Image, ImageTk
> >> E   ImportError: cannot import name 'ImageTk' from 'PIL' (/usr/lib/python3/dist-packages/PIL/__init__.py)
> 
> This is not a bug in cartopy, matplotlib tries to use ImageTk but the 
> package is not installed.
> 
> python3-matplotlib only Recommends python3-pil.imagetk, this should be a 
> Depends.

This issue is still present in matplotlib (3.5.0-2) and affects several 
packages. These should not have to add python3-pil.imagetk to their 
build dependencies because matplotlib does not pull it in.

The attached patch moves the Recommends to Depends.

Kind Regards,

Bas

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