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Fix default parameter assignment in Light Up when validating an
incomplete parameter string: if the user hand-types a game ID along
the lines of '18x10:stuff', we should not assume SYMM_ROT4 in the
resulting game_params, since it'll be failed by validate_params.

[originally from svn r9386]

--- a/lightup.c

+++ b/lightup.c

@@ -215,6 +215,11 @@

     if (*string == 's') {

         string++;

         EATNUM(params->symm);

+    } else {

+        /* cope with user input such as '18x10' by ensuring symmetry

+         * is not selected by default to be incompatible with dimensions */

+        if (params->symm == SYMM_ROT4 && params->w != params->h)

+            params->symm = SYMM_ROT2;

     }

     params->difficulty = 0;

     /* cope with old params */