SelectingTextWithATwist

[Rbtns]

I am using Tkinter with Python and I have a text box.  In this text box
I have something to the effect of:

ABCDEFGHIJKLMNOP
QRSTUVWXYZABCDEF


This is two lines of text in one text widget.  I want to be able to
select from the B in the first line to the X in the second line,
producing:

BCDEFGH
RSTUVWX

as if a box was drawn containing B-H and R-X not:

BCDEFGHIJKLMNOP
QRSTUVWX

as a regular text editor would do.

I think this can be accomplished through the highlight option/method or
a canvas behind the embeded text.  Can anyone help with this?
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