Index: wikidiff2.cpp
===================================================================
--- wikidiff2.cpp	(revision 91546)
+++ wikidiff2.cpp	(working copy)
@@ -74,12 +74,12 @@
 						// Print context
 						result += 
 							"<tr>\n"
-							"  <td class=\"diff-marker\"> </td>\n"
+							"  <td class=\"diff-marker\">&nbsp;</td>\n"
 							"  <td class=\"diff-context\">";
 						printTextWithDiv(*linediff[i].from[j]);
 						result += 
 							"</td>\n"
-							"  <td class=\"diff-marker\"> </td>\n"
+							"  <td class=\"diff-marker\">&nbsp;</td>\n"
 							"  <td class=\"diff-context\">";
 						printTextWithDiv(*linediff[i].from[j]);
 						result += "</td>\n</tr>\n";