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Check for duplicate puzzles during import changed

Related to issue #73

This is a better variant of the MR #33 (closed). This change will also use the creation timestamp to identify a duplicate puzzle.

When importing puzzles, duplicate puzzles are not imported. A puzzle is duplicated if a puzzle within a folder has the same cell content and the same creation timestamp.


  • I have opened an issue where I discuss the change I wish to make.
  • I'm using my own branch in my local copy. Ej, I want to merge myuser/opensudoku:my-new-contribution into develop.
  • All commits are signed.
  • I agree to release my code and all other changes of this MR under the GNU GPLv3 license.

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