Compare SCH_SHAPE UUIDs after comparing shape object coordinates.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/19716

eeschema/sch_shape.cpp

@@ -642,12 +642,36 @@ double SCH_SHAPE::Similarity( const SCH_ITEM& aOther ) const
 
 int SCH_SHAPE::compare( const SCH_ITEM& aOther, int aCompareFlags ) const
 {
-    int retv = SCH_ITEM::compare( aOther, aCompareFlags );
+    int cmpFlags = aCompareFlags;
+
+    // The object UUIDs must be compared after the shape coordinates because shapes do not
+    // have immutable UUIDs.
+    if( !( cmpFlags & ( SCH_ITEM::COMPARE_FLAGS::EQUALITY | SCH_ITEM::COMPARE_FLAGS::ERC ) ) )
+        cmpFlags |= SCH_ITEM::COMPARE_FLAGS::EQUALITY;
+
+    int retv = SCH_ITEM::compare( aOther, cmpFlags );
+
+    if( retv )
+        return retv;
+
+    retv = EDA_SHAPE::Compare( &static_cast<const SCH_SHAPE&>( aOther ) );
 
     if( retv )
         return retv;
 
-    return EDA_SHAPE::Compare( &static_cast<const SCH_SHAPE&>( aOther ) );
+    if( ( aCompareFlags & SCH_ITEM::COMPARE_FLAGS::EQUALITY )
+        || ( aCompareFlags & SCH_ITEM::COMPARE_FLAGS::ERC ) )
+    {
+        return 0;
+    }
+
+    if( m_Uuid < aOther.m_Uuid )
+        return -1;
+
+    if( m_Uuid > aOther.m_Uuid )
+        return 1;
+
+    return 0;
 }