=== modified file 'src/Fl_Menu.cxx'
--- src/Fl_Menu.cxx 2012-12-04 10:41:23 +0000
+++ src/Fl_Menu.cxx 2012-12-04 10:49:26 +0000
@@ -467,10 +467,14 @@
   }
 
   if (m->flags & FL_MENU_DIVIDER) {
+    int ofs = hh;
+    // center the dividing line if inactive and text == ""
+    if ((m->flags & FL_MENU_INACTIVE) && m->text && !m->text[0])
+      ofs = hh/2;
     fl_color(FL_DARK3);
-    fl_xyline(BW-1, yy+hh+(LEADING-2)/2, W-2*BW+2);
+    fl_xyline(BW-1, yy+ofs+(LEADING-2)/2, W-2*BW+2);
     fl_color(FL_LIGHT3);
-    fl_xyline(BW-1, yy+hh+((LEADING-2)/2+1), W-2*BW+2);
+    fl_xyline(BW-1, yy+ofs+((LEADING-2)/2+1), W-2*BW+2);
   }
 }