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Black Box: fix highlights in top left grid corner.

Patch due to Suller Andras, who noticed that the COL_HIGHLIGHT lines
at the top of the left clue bar and the left of the top one (i.e. the
ones next to the green 'done' button when it appears) were missing,
because the 'done' button was occupying a pixel too much space.

--- a/blackbox.c

+++ b/blackbox.c

@@ -1423,14 +1423,14 @@

         int outline = (ui->cur_visible && ui->cur_x == 0 && ui->cur_y == 0)

             ? COL_CURSOR : COL_BALL;

         clip(dr, TODRAW(0)-1, TODRAW(0)-1, TILE_SIZE+1, TILE_SIZE+1);

-        draw_circle(dr, TODRAW(0) + ds->crad, TODRAW(0) + ds->crad, ds->crad,

+        draw_circle(dr, TODRAW(0) + ds->crad-1, TODRAW(0) + ds->crad-1, ds->crad-1,

                     outline, outline);

-        draw_circle(dr, TODRAW(0) + ds->crad, TODRAW(0) + ds->crad, ds->crad-2,

+        draw_circle(dr, TODRAW(0) + ds->crad-1, TODRAW(0) + ds->crad-1, ds->crad-3,

                     COL_BUTTON, COL_BUTTON);

 	unclip(dr);

     } else {

         draw_rect(dr, TODRAW(0)-1, TODRAW(0)-1,

-		  TILE_SIZE+1, TILE_SIZE+1, COL_BACKGROUND);

+		  TILE_SIZE, TILE_SIZE, COL_BACKGROUND);

     }

     draw_update(dr, TODRAW(0), TODRAW(0), TILE_SIZE, TILE_SIZE);

     ds->reveal = state->reveal;