[Bug 95190] sudoku crashes when you try to undo clearing a non-empty tracker

[Joshua H. Rothenberg]

Public bug reported:

Binary package hint: gnome-games

Version: 1:2.18.0-0ubuntu1

Enable "Track Additions". Create a new tracker and select it. Anywhere
in the grid, enter a number that isn't marked red. Select "Clear
Tracker".  Select Edit > Undo, and it crashes.

** Affects: gnome-games (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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sudoku crashes when you try to undo clearing a non-empty tracker
https://launchpad.net/bugs/95190