Don't allow copying markers

Fixes KICAD-5FQ

eeschema/tools/sch_editor_control.cpp

@@ -1305,6 +1305,11 @@ bool SCH_EDITOR_CONTROL::doCopy( bool aUseDuplicateClipboard )
             // and the field text is in it
             selection.Add( item->GetParent() );
         }
+        else if( item->Type() == SCH_MARKER_T )
+        {
+            // Don't let the markers be copied
+            selection.Remove( item );
+        }
     }
 
     STRING_FORMATTER formatter;

pcbnew/tools/edit_tool.cpp

@@ -2712,6 +2712,11 @@ int EDIT_TOOL::copyToClipboard( const TOOL_EVENT& aEvent )
                     {
                         aCollector.Remove( item );
                     }
+                    else if( item->Type() == PCB_MARKER_T )
+                    {
+                        // Don't allow copying marker objects
+                        aCollector.Remove( item );
+                    }
                 }
             },