Bring back inline tag editing.
This was a KDE 4 JuK feature that had been left disabled in the port to Plasma 5/KF5. I finished the implementation here in response to a user request. Given the code changes it's technically best described as a new feature (even if it used to work in KDE 4) so it probably won't show up until the next release of KDE Applications, though it should be safe to backport for interested distributions. GUI: BUG:395948 FIXED-IN:18.08
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