[gnome-tetravex] Fix drawing code.

[Arnaud B. <arnaudb src gnome org>]

commit 7898c17b16e5ce767ed793b73bcac68909a305ec
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Sep 18 04:09:41 2019 +0200

    Fix drawing code.
    
    Static tiles were drawn twice,
    making a moving tile displayed
    under them. More work would be
    needed to handle the inversion
    of two contiguous tiles, where
    one tile is always drawn after
    the other, causing half of the
    time a little drawing problem.

 src/puzzle-view.vala | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/src/puzzle-view.vala b/src/puzzle-view.vala
index 7df7f30..d11a8fd 100644
--- a/src/puzzle-view.vala
+++ b/src/puzzle-view.vala
@@ -341,6 +341,11 @@ private class PuzzleView : Gtk.DrawingArea
              && (image.y == image.target_y))
                 continue;
 
+            if ((selected_tile == null)
+             && (image.x == image.target_x)
+             && (image.y == image.target_y))
+                continue;
+
             context.save ();
             context.translate ((int) (image.x + 0.5), (int) (image.y + 0.5));
             if (puzzle.paused)