[Weechat-support] escape sequence and xfce4-terminal

[fusillator]

Hi all, I'm totally new to weechat and maybe this is a silly question,
anyway I'm trying to figure out how to enable the escape sequence from a
xfce4-terminal to move the cursor among the weechat's windows.
I tried the sequence alt left arrow and alt right arrow as suggested in
the user manual but those sequences seems to be not included in the
preset bindings, so I added them with key command, now the key listdiff
includes the following key combination:
 
meta-1;3C => /window left
meta-1;3D => /window right
meta-^[[1;3C => /window left
meta-^[[1;3D => /window right
meta-a => /window left
meta-s => /window right

the combination alt-a alt-s works like a sharm, but the alt arrow key
doesnt.
I also tried to follow the hint of the faq adding the directive
XTerm*metaSendsEscape: true in the file ~/.Xresources (and restarting
the X session) but I didn't fix.
Any idea?
Regards

Luca