gets the available space better, should prevent some infinite loops

until the layout is done properly
PR: bug id 3475
Submitted by:	Paul Austin <p_d_austin@yahoo.com>


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@194460 13f79535-47bb-0310-9956-ffa450edef68

src/org/apache/fop/fo/flow/ExternalGraphic.java

@@ -143,7 +143,8 @@ public class ExternalGraphic extends FObj {
             double ratio = ((double)width) / ((double)height);
             int areaWidth = area.getAllocationWidth() - startIndent
                             - endIndent;
-            int pageHeight = area.getPage().getHeight();
+            int pageHeight = area.getPage().getBody().getMaxHeight()
+                             - spaceBefore;
             if (height > pageHeight) {
                 height = pageHeight;
                 width = (int)(ratio * ((double)height));