D7560: Properly show/hide preview dialog

[Christian Ehrlicher]

chehrlic added a comment.


  This patch is still needed - https://phabricator.kde.org/D7566 was needed for the initial copying of the puzzles from the global to the local storage. This one here is needed for the sync of the preview check state button and the proper recreation of the preview image when opening the same puzzle again after switching back to overview (see test plan).

REPOSITORY
  R423 Palapeli

REVISION DETAIL
  https://phabricator.kde.org/D7560

To: chehrlic, #kde_games
Cc: ltoscano, #kde_games
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