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Robustness in the face of a completely configurable expansion factor.

[originally from svn r4464]

--- a/rect.c

+++ b/rect.c

@@ -403,9 +403,9 @@

      * generate the base grid.

      */

     params2->w = params->w / (1.0F + params->expandfactor);

-    if (params2->w < 1) params2->w = 1;

-    params2->h = params->h * (1.0F + params->expandfactor);

-    if (params2->h < 1) params2->h = 1;

+    if (params2->w < 2 && params->w >= 2) params2->w = 2;

+    params2->h = params->h / (1.0F + params->expandfactor);

+    if (params2->h < 2 && params->h >= 2) params2->h = 2;

     grid = snewn(params2->w * params2->h, int);