As a Wikidata editor I want to be able to enter a value that contains a space character for an external ID Property like [[ https://www.wikidata.org/wiki/Property:P8419 | Archive Of Our Own tag (P8419) ]] and have the URL to result to the entry of the value on the external website.
One example: When I follow the link provided by [[ https://www.wikidata.org/wiki/Property:P8419 | Archive Of Our Own tag (P8419) ]], spaces in the value are replaced by "+" in the resulting URL and the link does not work. <- For this particular example this is now no longer the case because on WD the [[ https://www.wikidata.org/wiki/Property:P8419#P1630 | formatter URL ]] has been replaced by a tool that handles this better.
https://test.wikidata.org/wiki/Q140422 - the external ID "Harry Potter" contains a space. The space is converted to a + in the URL instead of leaving it a space or encoding it to %20.
Editor does not manually replace space character with %20 in entered value.
See report on [[ https://www.wikidata.org/wiki/Property_talk:P8419 | Property talk:P8419 ]].
* Do we always want to convert spaces to %20 in external IDs?
Yes, unless "other website" needs us to code it differently