Use m_numRefStr when converting back to string.

(It main contain leading zeroes.)

Fixes https://gitlab.com/kicad/code/kicad/-/issues/19724

eeschema/sch_reference_list.cpp

@@ -666,7 +666,7 @@ int SCH_REFERENCE_LIST::CheckAnnotation( ANNOTATION_ERROR_HANDLER aHandler )
         if( m_flatList[ii].m_isNew )    // Not yet annotated
         {
             if( m_flatList[ii].m_numRef >= 0 )
-                tmp << m_flatList[ii].m_numRef;
+                tmp << m_flatList[ii].m_numRefStr;
             else
                 tmp = wxT( "?" );
 
@@ -694,7 +694,7 @@ int SCH_REFERENCE_LIST::CheckAnnotation( ANNOTATION_ERROR_HANDLER aHandler )
         if( std::max( m_flatList[ii].GetLibPart()->GetUnitCount(), 1 ) < m_flatList[ii].m_unit )
         {
             if( m_flatList[ii].m_numRef >= 0 )
-                tmp << m_flatList[ii].m_numRef;
+                tmp << m_flatList[ii].m_numRefStr;
             else
                 tmp = wxT( "?" );
 
@@ -733,7 +733,7 @@ int SCH_REFERENCE_LIST::CheckAnnotation( ANNOTATION_ERROR_HANDLER aHandler )
         if( first.m_unit == second.m_unit )
         {
             if( first.m_numRef >= 0 )
-                tmp << first.m_numRef;
+                tmp << first.m_numRefStr;
             else
                 tmp = wxT( "?" );
 
@@ -753,12 +753,12 @@ int SCH_REFERENCE_LIST::CheckAnnotation( ANNOTATION_ERROR_HANDLER aHandler )
         if( first.GetLibPart()->GetUnitCount() != second.GetLibPart()->GetUnitCount() )
         {
             if( first.m_numRef >= 0 )
-                tmp << first.m_numRef;
+                tmp << first.m_numRefStr;
             else
                 tmp = wxT( "?" );
 
             if( second.m_numRef >= 0 )
-                tmp2 << second.m_numRef;
+                tmp2 << second.m_numRefStr;
             else
                 tmp2 = wxT( "?" );
 

eeschema/sch_reference_list.h

@@ -191,7 +191,7 @@ public:
         if( GetSymbol() && GetLibPart() && GetLibPart()->IsPower() )
             ref = wxT( "0" );
 
-        return ref << m_numRef;
+        return ref << m_numRefStr;
     }
 
     int CompareValue( const SCH_REFERENCE& item ) const