D18420: Optimize and reduce code in GuiObserver

[Christoph Roick]

croick added a comment.


  Would you agree on such a change?
  `case "Worksheet"_hash:` is still human-readable (compare to `if (className == "Worksheet")`.
  The very unlikely case of a hash collision would appear at compile time (if new dock widgets are introduced).
  On the other hand the selection of the right dock is now more efficient than before.

REPOSITORY
  R262 LabPlot

REVISION DETAIL
  https://phabricator.kde.org/D18420

To: croick, #labplot
Cc: kde-edu, narvaez, apol
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