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Tents: reinstate bottom and right grid borders.

They disappeared in commit c0da615a933a667: I removed all the
per-puzzle code that erased the whole game window on first draw, and
accidentally also took out the code that drew the Tents grid.

Each individual grid tile includes its left and top grid lines, so
most of the grid ended up being drawn anyway by draw_tile(). But the
right and bottom borders aren't within any tile, so they weren't.

--- a/tents.c

+++ b/tents.c

@@ -1461,6 +1461,7 @@

 struct game_drawstate {

     int tilesize;

+    bool started;

     game_params p;

     int *drawn, *numbersdrawn;

     int cx, cy;         /* last-drawn cursor pos, or (-1,-1) if absent. */

@@ -1939,6 +1940,7 @@

     int i;

     ds->tilesize = 0;

+    ds->started = false;

     ds->p = state->p;                  /* structure copy */

     ds->drawn = snewn(w*h, int);

     for (i = 0; i < w*h; i++)

@@ -2408,11 +2410,13 @@

       if (cx != ds->cx || cy != ds->cy) cmoved = true;

     }

-    if (printing) {

+    if (printing || !ds->started) {

+	if (printing)

+	    print_line_width(dr, TILESIZE/64);

+

         /*

          * Draw the grid.

          */

-        print_line_width(dr, TILESIZE/64);

         for (y = 0; y <= h; y++)

             draw_line(dr, COORD(0), COORD(y), COORD(w), COORD(y), COL_GRID);

         for (x = 0; x <= w; x++)