compatibility issue with Matplotlib-3.4.1

[stonebig]

hello,

I use Matplotlib-3.4.1 + Holoviews-1.14.2, and I have this unexpected error. Why this could not more work ? (nothing supposed to have changed on Holoviews or Matplotlib)

Any suggestion how I could track this down ?

validate_capstyle

[stonebig]

.. hum this is tricky to me

[stonebig]

validate_capstyle, validate_fontsize, validate_joinstyle seems not to exist anymore ?

[stonebig]

validate_capstyle was in Matplotlib-3.3.0 https://matplotlib.org/3.3.0/_modules/matplotlib/rcsetup.html

[stonebig]

this comit from matplotlib matplotlib/matplotlib@d2de8a2#diff-cbdeb0e4217c66c0eab3ff5027da14906cb705419722f8269bc9ccaadd2422b1

[stonebig]

this is gone, but I don't know how to rewrite it so

[stonebig]

[stonebig]

so the patch may be this: #4878

from matplotlib.rcsetup import (
    validate_fontsize, validate_fonttype, validate_hatch)

try:  # starting Matplotlib 3.4.0
    from matplotlib._enums import CapStyle as validate_capstyle
    from matplotlib._enums import JoinStyle as validate_joinstyle
except:  # before Matplotlib 3.4.0
    from matplotlib.rcsetup import (
    validate_capstyle, validate_joinstyle)

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