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Attempting to begin a drag from (i.e. just click on) the hint pegs
for a past guess caused strangeness up to and including segfault,
thanks to bad bounds checking. Well spotted John Sullivan.

[originally from svn r6040]

--- a/guess.c

+++ b/guess.c

@@ -637,7 +637,7 @@

         } else {

             over_hint = 1;

         }

-    } else if (x >= guess_ox &&

+    } else if (x >= guess_ox && x <= (guess_ox + GUESS_W) &&

                y >= GUESS_OY && y < guess_oy) {

         over_past_guess_y = (y - GUESS_OY) / PEGOFF;

         over_past_guess_x = (x - guess_ox) / PEGOFF;