decodes some special chars in a URL query
feature #12223 decodes some special chars in a URL query (dawehner)

This PR was merged into the 2.6-dev branch.

Discussion
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decodes some special chars in a URL query

| Q             | A
| ------------- | ---
| Bug fix?      | yes|no (not sure :) )
| New feature?  | no
| BC breaks?    | yes|no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12200
| License       | MIT
| Doc PR        |

Commits
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cd2c2e3 decodes some special chars in a URL query