Don't respond to Duplicate events while placing multiple copies of a symbol.

It doesn't really make any sense as clicking will just create another copy
as well.

Fixes https://gitlab.com/kicad/code/kicad/issues/13253

eeschema/tools/sch_drawing_tools.cpp

@@ -301,7 +301,7 @@ int SCH_DRAWING_TOOLS::PlaceSymbol( const TOOL_EVENT& aEvent )
             {
                 m_toolMgr->RunAction( EE_ACTIONS::clearSelection, true );
 
-                // Pick the footprint to be placed
+                // Pick the symbol to be placed
                 bool footprintPreviews = m_frame->eeconfig()->m_Appearance.footprint_preview;
                 PICKED_SYMBOL sel = m_frame->PickSymbolFromLibTree( &filter, *historyList, true,
                                                                     1, 1, footprintPreviews );
@@ -412,6 +412,20 @@ int SCH_DRAWING_TOOLS::PlaceSymbol( const TOOL_EVENT& aEvent )
                 }
             }
         }
+        else if( evt->IsAction( &ACTIONS::duplicate ) )
+        {
+            if( symbol )
+            {
+                // This doesn't really make sense; we'll just end up dragging a stack of
+                // objects so we ignore the duplicate and just carry on.
+                wxBell();
+                continue;
+            }
+
+            // Exit.  The duplicate will run in its own loop.
+            m_frame->PopTool( aEvent );
+            break;
+        }
         else if( symbol && ( evt->IsAction( &ACTIONS::refreshPreview ) || evt->IsMotion() ) )
         {
             symbol->SetPosition( cursorPos );

eeschema/tools/sch_move_tool.cpp

@@ -790,6 +790,7 @@ int SCH_MOVE_TOOL::Main( const TOOL_EVENT& aEvent )
             {
                 // This doesn't really make sense; we'll just end up dragging a stack of
                 // objects so we ignore the duplicate and just carry on.
+                wxBell();
                 continue;
             }