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tmux can't handle short cuts that use my alt key

For example:

bind-key -n M-l next-window
bind-key -n M-h previous-window

I have noticed that when I type M-l and M-h in my shell I get these character: ì, è

I'm guessing that related somehow.

I'm using xterm btw. and ubuntu.

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In my .Xdefaults I added the following line:

XTerm*eightBitInput: true

Then I reran it with

xrdb -merge .Xdefaults

Now when I start up new xterms, the alt key works as it should.

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