Umbrella ticket for maintenance and code quality tasks within the current WMDE-QWERTY-Sprint-2019-05-15 that are not strictly necessary for a user-facing story.
- A larger series of patches restructuring code in the FileImporter extension. Mostly part of T212199 as well as T213821 and T198584, but not necessarily all tagged with these ticket numbers.
- Tagged and released Wikidiff2 to allow soon deployment of the bugfix and performance improvements: ( also part of T223391#5190777 )
- Fix the fade-out gradient in Reference Previews sometimes not disappearing: https://gerrit.wikimedia.org/r/511384
- Removed Ruby browser tests from Two-Column-Edit-Conflict-Merge to avoid failing tests: ( also part of T222714 )
- Fix Two-Column-Edit-Conflict-Merge browser tests failing due to VisualEditor
- CI enhancements and stability, T223967
- Fix an incomplete hook documentation, relevant for FileImporter: https://gerrit.wikimedia.org/r/510990
- Fix a circular dependency in Cognate: https://gerrit.wikimedia.org/r/507752
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