Don't update 3D view on cursor movement

Our rendering pipeline is not set up for this kind of speed,
and this is a blocking operation at the moment.

Note that we will get an update at the end of the move
because OnModify does it.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/6819

pcbnew/tools/edit_tool.cpp

@@ -403,8 +403,6 @@ int EDIT_TOOL::doMoveSelection( TOOL_EVENT aEvent, bool aPickReference )
         {
             if( m_dragging && evt->Category() == TC_MOUSE )
             {
-                bool requestRedraw3Dview = false;
-
                 VECTOR2I mousePos( controls->GetMousePosition() );
 
                 m_cursor = grid.BestSnapAnchor( mousePos, item_layers, sel_items );
@@ -437,14 +435,8 @@ int EDIT_TOOL::doMoveSelection( TOOL_EVENT aEvent, bool aPickReference )
                     // group and not its descendants.
                     if( !item->GetParent() || !item->GetParent()->IsSelected() )
                         static_cast<BOARD_ITEM*>( item )->Move( movement );
-
-                    if( item->Type() == PCB_FOOTPRINT_T )
-                        requestRedraw3Dview = true;
                 }
 
-                if( requestRedraw3Dview )
-                    editFrame->Update3DView( true );
-
                 m_toolMgr->PostEvent( EVENTS::SelectedItemsMoved );
             }
             else if( !m_dragging && !evt->IsAction( &ACTIONS::refreshPreview ) )