Launcher3 the hotseat bar, prohibit dragging, prevent the formation of folders

The form of a folder is implemented in the OnDrop () method in Workspace.java.
In Workspace.java If you drag the icon to make a folder, call the Workspace-createuserfolderifnecessary () method,
If the dragged icon can be added to a folder, the Workspace-addtoexistingfolderifnecessary () method is called.
If the condition of the folder is not met, the Celllayout-performreorder method is called, which is the effect of squeezing the current icon if the current landing point is occupied when the drag icon is processed.
So we add a judgment outside of the call Createuserfolderifnecessary () method that can synthesize a folder file to see if it is above hotseat,