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Patch from Mike: fix an array indexing error in the clue
highlighting, and adjust the presets.

[originally from svn r6303]

--- a/loopy.c

+++ b/loopy.c

@@ -430,10 +430,12 @@

     { "7x7 Easy",     {  7,  7, DIFF_EASY, 0 } },

     { "7x7 Normal",   {  7,  7, DIFF_NORMAL, 0 } },

     { "10x10 Easy",   { 10, 10, DIFF_EASY, 0 } },

-#ifndef SLOW_SYSTEM

     { "10x10 Normal", { 10, 10, DIFF_NORMAL, 0 } },

+#ifndef SLOW_SYSTEM

     { "15x15 Easy",   { 15, 15, DIFF_EASY, 0 } },

-    { "30x20 Easy",   { 30, 20, DIFF_EASY, 0 } }

+    { "15x15 Normal", { 15, 15, DIFF_NORMAL, 0 } },

+    { "30x20 Easy",   { 30, 20, DIFF_EASY, 0 } },

+    { "30x20 Normal", { 30, 20, DIFF_NORMAL, 0 } }

 #endif

 };

@@ -2591,7 +2593,7 @@

             clue_mistake = (square_order(state, i, j, LINE_YES) > n     || 

                             square_order(state, i, j, LINE_NO ) > (4-n));

-            if (clue_mistake != ds->clue_error[i * w + j]) {

+            if (clue_mistake != ds->clue_error[j * w + i]) {

                 draw_rect(dr, 

                           BORDER + i * TILE_SIZE + CROSS_SIZE,

                           BORDER + j * TILE_SIZE + CROSS_SIZE,

@@ -2606,7 +2608,7 @@

                 draw_update(dr, i * TILE_SIZE + BORDER, j * TILE_SIZE + BORDER,

                             TILE_SIZE, TILE_SIZE);

-                ds->clue_error[i * w + j] = clue_mistake;

+                ds->clue_error[j * w + i] = clue_mistake;

             }

         }

     }