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Pattern: Reduce row clue spacing if there are lots of them

Normally, we put two spaces between row clues, but if there are a lot
then even with a smaller font size they might overflow the left edge
of the window.  To compensate, go down to one space between clues
instead of two if there are a lot of them.  On my laptop the GTK build
demonstrates overflow with "13x1:1//1//1//1//1//1//1/1.1.1.1.1.1.1".

--- a/pattern.c

+++ b/pattern.c

@@ -1853,11 +1853,15 @@

     } else {

         int x, y;

         size_t off = 0;

+        const char *spaces = "  ";

         assert(rowlen <= state->common->rowsize);

         *ds->strbuf = '\0';

+        /* Squish up a bit if there are lots of clues. */

+        if (rowlen > TLBORDER(state->common->w)) spaces++;

         for (j = 0; j < rowlen; j++)

-            off += sprintf(ds->strbuf + off, "%s%d", j ? "  " : "", rowdata[j]);

+            off += sprintf(ds->strbuf + off, "%s%d",

+                           j ? spaces : "", rowdata[j]);

         y = ry;

         x = BORDER + TILE_SIZE * (TLBORDER(state->common->w)-1);

         draw_text(dr, x+TILE_SIZE, y+TILE_SIZE/2, FONT_VARIABLE,