Well, it was not easy as "to sit at a table over a beer or wine".
Often, between Switzerland and the then divided Italian states - The Duchy of Milan, the Duchy of Savoy etc- it involved wars or land donations from one Emperor (Charles IV my mistake, it was Charles V) or one King (Francois I) , usually "Italian" as recognition for services or payment for troops (basically in the late middle age the Swiss soldiers were rented by their government to either France or the Empire and were the Landsknechts antagonists.
What is now the Italian speaking Swiss district (Canton Ticino) was once part of Milan's Duchy.
The Graubunden-Duchy frontier moved back and forth in the Valtellina region for quite a long time...
But the border that will be now redrawn, was established by a treaty in 1861 (or so) when Italy became a
united country again (after so many centuries of divisions, foreign depredations, dominations and colonization).
And, both Bob and the Stranger are right. Wit hte melting of the Glacier, "rocks" may appear which were once hidden, and since a Glacier is a "living" moving thing, if receding too much (like it appears to be now) the borders could vary too much.
Now, I'd guess that if the Ice were increasing, instead of receding, the Swiss would be very happy to acquire new "land"...
A popular joke here in Northern Italy, by people living on the borders with Switzerland is :
"Let's declare war to Switzerland, and quick, let them invade so we shall promptly surrender and let them annex us"
Edited by Nobody - 4/2/2009 at 11:02 am