New submission from mps :
tkinter is the first GUI interface used by novices.
They often get in trouble when they create a new Tk instance instead of a
Toplevel.
It would be helpful to output a warning message in this case (i.e. checking
_default_root is not None and _support_default_root is
New submission from mps:
I apologize if it has already been reported but I was unable to find similar
issue reported using "search".
Maybe just add:
def moveto(self, tagOrId, xPos, yPos):
"""Move the items given by tagOrId in the canvas coordinate
