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ref: 44e2690abb523aa60558ca6326eaeb9ce6287454
parent: 80b63e6cefb0e1055bdd5f2f8238d7cc8c23f51f
author: Jonas Kölker <jonaskoelker@yahoo.com>
date: Tue Oct 13 11:47:42 EDT 2015 

Highlight clue errors in Tracks in some more situations.

 - Count any square as having a track either if the square is marked
   as such (rendered as a different background), or if at least one
   adjacent edge is marked as containing a segment of train track
   (rendered as train tracks if they're placed, else as an '=').

 - Do the same counting in rows and columns.


--- a/tracks.c
+++ b/tracks.c
@@ -1538,7 +1538,8 @@
         target = state->numbers->numbers[x];
         ntrack = nnotrack = 0;
         for (y = 0; y < h; y++) {
-            if (S_E_COUNT(state, x, y, E_TRACK) > 0)
+            if (S_E_COUNT(state, x, y, E_TRACK) > 0 ||
+                state->sflags[y*w+x] & S_TRACK)
                 ntrack++;
             if (state->sflags[y*w+x] & S_NOTRACK)
                 nnotrack++;
@@ -1557,7 +1558,8 @@
         target = state->numbers->numbers[w+y];
         ntrack = nnotrack = 0;
         for (x = 0; x < w; x++) {
-            if (S_E_COUNT(state, x, y, E_TRACK) == 2)
+            if (S_E_COUNT(state, x, y, E_TRACK) > 0 ||
+                state->sflags[y*w+x] & S_TRACK)
                 ntrack++;
             if (state->sflags[y*w+x] & S_NOTRACK)
                 nnotrack++;