Coordinate conversion error

[XCram]

First of all, I am very grateful to the author of this code (Tom Schimansky).

And I want to share my experience of using it.
I found a bug in the convert_canvas_coords_to_decimal_coords function.

Screen size (self.height ; self.width) is different from canvas size (self.canvas.winfo_height() ; self.canvas.winfo_width()) and we have to use screen size in it.
Otherwise, there may be displacements along the axes that affect the display of coordinates (right mouse button).

It was the incorrect display of coordinates that I encountered. And, unfortunately, it took a lot of time to find the root cause.