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And I _always_ forget to clear the background when first drawing the
display of a new game, so I'll add it to nullgame.c and hope that
makes me remember it next time!

[originally from svn r4213]

--- a/nullgame.c

+++ b/nullgame.c

@@ -164,6 +164,13 @@

                  game_state *state, game_ui *ui,

                  float animtime, float flashtime)

 {

+    /*

+     * The initial contents of the window are not guaranteed and

+     * can vary with front ends. To be on the safe side, all games

+     * should start by drawing a big background-colour rectangle

+     * covering the whole window.

+     */

+    draw_rect(fe, 0, 0, 200, 200, COL_BACKGROUND);

 }

 float game_anim_length(game_state *oldstate, game_state *newstate)