Fix the TemplateLoader for the new API in importlib_resources.

Fix #691 (closed)

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• 430978d3 - Fix the TemplateLoader for the new API in importlib_resources.

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• d507a90a - Fix the TemplateLoader for the new API in importlib_resources.

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I am really split between merging this since it would make the ask in #690 (closed) hard to comply. The new API that I am porting the code here to does not exist in standard library of Ptyhon 3.7+ and I am not sure if it is even going to be released as a part of 3.7,3.8 ever since it is not a bugfix but a new feature.

It would mean distros would have to undo this PR and also re-apply their patch for importlib_resource -> importlib.resoruces.

@msapiro Thoughts?

mentioned in commit 98274cbd

merged

mentioned in issue #690 (closed)

mentioned in issue postorius#406 (closed)

@maxking As this breaks postorius 1.3.2 it would be great if you could release a new mailman version with this fix included, as this will break in the wild.

Yeah, I am actually working on a new release for Core. Should be coming out soon.