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tracks: Make error clue background white

This makes them stand out more.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

--- a/tracks.c

+++ b/tracks.c

@@ -2140,7 +2140,7 @@

     COL_GRID, COL_CLUE, COL_CURSOR,

     COL_TRACK, COL_TRACK_CLUE, COL_SLEEPER,

     COL_DRAGON, COL_DRAGOFF,

-    COL_ERROR, COL_FLASH,

+    COL_ERROR, COL_FLASH, COL_ERROR_BACKGROUND,

     NCOLOURS

 };

@@ -2157,6 +2157,7 @@

         ret[COL_CLUE             * 3 + i] = 0.0F;

         ret[COL_GRID             * 3 + i] = 0.75F;

         ret[COL_CURSOR           * 3 + i] = 0.6F;

+        ret[COL_ERROR_BACKGROUND * 3 + i] = 1.0F;

     }

     ret[COL_SLEEPER * 3 + 0] = 0.5F;

@@ -2519,7 +2520,7 @@

             ds->num_errors[i] = state->num_errors[i];

             draw_clue(dr, ds, w, state->numbers->numbers[i], i,

                       ds->num_errors[i] ? COL_ERROR : COL_CLUE,

-		      COL_BACKGROUND);

+		      ds->num_errors[i] ? COL_ERROR_BACKGROUND : COL_BACKGROUND);

         }

     }