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Hoist fetch out of loop

--- a/tui_main.c

+++ b/tui_main.c

@@ -466,6 +466,7 @@

   if (rows == 0 || cols == 0)

     return;

   bool use_rulers = ruler_spacing_y != 0 && ruler_spacing_x != 0;

+  chtype bullet = ACS_BULLET;

   for (Usz iy = 0; iy < rows; ++iy) {

     Usz line_offset = (offset_y + iy) * field_w + offset_x;

     Glyph const* g_row = gbuffer + line_offset;

@@ -479,7 +480,7 @@

         if (use_y_ruler && (ix + offset_x) % ruler_spacing_x == 0)

           ch = '+';

         else

-          ch = ACS_BULLET;

+          ch = bullet;

       } else {

         ch = (chtype)g;

       }