Flexibility of number of labels along edges in UNL_LOOK diagram

Based on https://stackoverflow.com/questions/79338813/how-to-make-doxygen-generate-full-list-of-fields-in-class-diagram making the fixed number of 10 labels along the edge of a UNL_LOOK diagram more flexible.

Author: albert-github

src/config.xml

@@ -3921,6 +3921,18 @@ where `loc1` and `loc2` can be relative or absolute paths or URLs.
  exceeded by 50% before the limit is enforced. So when you set the threshold
  to 10, up to 15 fields may appear, but if the number exceeds 15, the
  total amount of fields shown is limited to 10.
+]]>
+      </docs>
+    </option>
+    <option type='int' id='UML_LIMIT_EDGE_FIELDS' defval='10' minval='0' maxval='100' depends='UML_LOOK'>
+      <docs>
+<![CDATA[
+ If the \ref cfg_uml_look "UML_LOOK" tag is enabled, fields are shown along
+ the edge between 2 clas nodes.
+ If there are many fields and many nodes the
+ graph may become too big to be useful. The \c UML_LIMIT_EDGE_FIELDS
+ threshold limits the number of items to make the size more
+ manageable. Set this to 0 for no limit.
 ]]>
       </docs>
     </option>

src/dotclassgraph.cpp

@@ -231,17 +231,17 @@ static QCString joinLabels(const StringSet &ss)
 {
   QCString label;
   int count=1;
-  int maxLabels=10;
+  int maxLabels = Config_getInt(UML_LIMIT_EDGE_FIELDS);
   auto it = std::begin(ss), e = std::end(ss);
   if (it!=e) // set not empty
   {
     label += (*it++).c_str();
-    for (; it!=e && count < maxLabels ; ++it,++count)
+    for (; it!=e && (maxLabels == 0 || count < maxLabels) ; ++it,++count)
     {
       label += '\n';
       label += (*it).c_str();
     }
-    if (count==maxLabels) label+="\n...";
+    if (maxLabels != 0 && count==maxLabels) label+="\n...";
   }
   return label;
 }