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SWHID: deal with escaping in origin qualifiers

Stefano Zacchiroli requested to merge generated-differential-D3065-source into generated-differential-D3065-target

The current spec is incorrect on this point, as (at least) ";" can appear in origin URLs, and hence SWHID origin qualifiers, breaking SWHID parsing. This is a minimal proposal that only requires to URL-escape the "%" and ";" characters, as we do for paths.

... but to be honest the more I look into this the more it worries me. It would be much better to fully percent-escape origin URLs, but that has the drawback of making SWHID much less nicer to read.

I hope only escaping these two characters is enough, but I'm not entirely sure it is...

Migrated from D3065 (view on Phabricator)

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