Items added to a selection for a drag should only be temporary.

After the drag, cancel, or undo, only the originally-selected items
should remain selected.

eeschema/tools/ee_tool_base.h

@@ -117,6 +117,12 @@ protected:
     void saveCopyInUndoList( EDA_ITEM* aItem, UNDO_REDO_T aType, bool aAppend = false )
     {
         KICAD_T itemType = aItem->Type();
+        bool    selected = aItem->IsSelected();
+
+        // IS_SELECTED flag should not be set on undo items which were added for
+        // a drag operation.
+        if( selected && aItem->HasFlag( TEMP_SELECTED ))
+            aItem->ClearSelected();
 
         if( m_isLibEdit )
         {
@@ -133,6 +139,9 @@ protected:
             else
                 editFrame->SaveCopyInUndoList( (SCH_ITEM*) aItem, aType, aAppend );
         }
+
+        if( selected && aItem->HasFlag( TEMP_SELECTED ) )
+            aItem->SetSelected();
     }
 
 protected:

eeschema/tools/sch_move_tool.cpp

@@ -431,6 +431,8 @@ int SCH_MOVE_TOOL::Main( const TOOL_EVENT& aEvent )
     for( EDA_ITEM* item : selection )
         item->ClearEditFlags();
 
+    m_selectionTool->RemoveItemsFromSel( &m_dragAdditions, QUIET_MODE );
+
     if( restore_state )
     {
         m_frame->RollbackSchematicFromUndo();