D12912: Improve Hint and Solve action visibility and enabled state

[Albert Astals Cid]

aacid accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R417 KSudoku

BRANCH
  fix-hintsolve

REVISION DETAIL
  https://phabricator.kde.org/D12912

To: gregormi, #kde_games, aacid
Cc: aacid, kde-games-devel
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