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Solo: Set max difficulty for small jigsaw puzzles

(cherry picked from Android port, commit
5c9a7b64a06d07f97a41622c4b91d81f3419a51b)

--- a/solo.c

+++ b/solo.c

@@ -3654,10 +3654,11 @@

      * the puzzle size: all 2x2 puzzles appear to be Trivial

      * (DIFF_BLOCK) so we cannot hold out for even a Basic

      * (DIFF_SIMPLE) one.

+     * Jigsaw puzzles of size 2 and 3 are also all trivial.

      */

     dlev.maxdiff = params->diff;

     dlev.maxkdiff = params->kdiff;

-    if (c == 2 && r == 2)

+    if ((c == 2 && r == 2) || (r == 1 && c < 4))

         dlev.maxdiff = DIFF_BLOCK;

     grid = snewn(area, digit);