[gnome-klotski] Fix a bug.

[Arnaud B. <arnaudb src gnome org>]

commit 71a635b2b0f849679a9bd1cb63b9e358fb35a11c
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sat Feb 8 19:28:18 2020 +0100

    Fix a bug.
    
    Loading a puzzle was not clearing
    completely the view state, so the
    first move done may be uncounted.

 src/puzzle-view.vala | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/puzzle-view.vala b/src/puzzle-view.vala
index 7c300b5..45bb9fa 100644
--- a/src/puzzle-view.vala
+++ b/src/puzzle-view.vala
@@ -60,7 +60,9 @@ private class PuzzleView : Gtk.DrawingArea
             _puzzle.changed.connect (puzzle_changed_cb);
             piece_x = 0;
             piece_y = 0;
+            piece_unmoved = false;
             piece_id = '\0';
+            last_piece_id = '\0';
             queue_draw ();
         }
     }