Now that you found out anyway, I can see it in the documentation, too :-)

It's a bit cryptic, however.
If index refers to the end of the text (the character after the last newline) then the new text is inserted just before the last newline instead.
is probably meant to say
Trying to insert anywhere after the end of existing text results in simply appending.

In reply to Re^3: difficulty inserting at line and character col in tkx text widget by soonix
in thread difficulty inserting at line and character col in tkx text widget by previous

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