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Experimental UI tweak enabled by a hacky environment variable:
suppress the display of `this square can't be a light' blobs in a
lit square, on the grounds that we already know _lit_ squares can't
be lights. This makes the solved game look cleaner (I've always
thought the detritus of blobs on some but not all non-light squares
looked messy), but on the other hand it's slightly jarring during
play. So I'm checking it in, but as a configurable option which is
off by default.

[originally from svn r7656]

--- a/lightup.c

+++ b/lightup.c

@@ -2077,10 +2077,19 @@

             int lcol = (ds_flags & DF_OVERLAP) ? COL_ERROR : COL_LIGHT;

             draw_circle(dr, dx + TILE_SIZE/2, dy + TILE_SIZE/2, TILE_RADIUS,

                         lcol, COL_BLACK);

-        } else if (ds_flags & DF_IMPOSSIBLE) {

-            int rlen = TILE_SIZE / 4;

-            draw_rect(dr, dx + TILE_SIZE/2 - rlen/2, dy + TILE_SIZE/2 - rlen/2,

-                      rlen, rlen, COL_BLACK);

+        } else if ((ds_flags & DF_IMPOSSIBLE)) {

+            static int draw_blobs_when_lit = -1;

+            if (draw_blobs_when_lit < 0) {

+		char *env = getenv("LIGHTUP_LIT_BLOBS");

+		draw_blobs_when_lit = (!env || (env[0] == 'y' ||

+                                                env[0] == 'Y'));

+            }

+            if (!(ds_flags & DF_LIT) || draw_blobs_when_lit) {

+                int rlen = TILE_SIZE / 4;

+                draw_rect(dr, dx + TILE_SIZE/2 - rlen/2,

+                          dy + TILE_SIZE/2 - rlen/2,

+                          rlen, rlen, COL_BLACK);

+            }

         }

     }