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Bring Pearl's game-completion handling in line with my usual practice:
the 'completed' flag is not reset if you make a new move transforming
a solved game into an unsolved state, so the game won't flash again if
you manually erase and redraw a line segment (though it still will if
you undo and redo past the first solved state in the undo history).

[originally from svn r9750]

--- a/pearl.c

+++ b/pearl.c

@@ -1640,8 +1640,6 @@

     if (!had_error && loopclass != -1) {

         state->completed = TRUE;

         state->loop_length = dsfsize[loopclass];

-    } else {

-        state->completed = FALSE;

     }

     sfree(dsf);

@@ -2450,8 +2448,8 @@

 static float game_flash_length(game_state *oldstate, game_state *newstate,

 			       int dir, game_ui *ui)

 {

-    if (!oldstate->completed &&

-        newstate->completed && !newstate->used_solve)

+    if (!oldstate->completed && newstate->completed &&

+        !oldstate->used_solve && !newstate->used_solve)

         return FLASH_TIME;

     else

         return 0.0F;