Using ctrl+pageup and ctrl+pagedown to switch tabs in gnome-terminal works fine.
But if you are on one of the "end" tabs and you use a tab switch command that
would go "past the end" the tab does not switch and garbage text like "^[[5;5~"
is sent to the terminal.

Personally, I would prefer the current tab to wrap around to the other end. That
way I can always switch tabs in either direction and still get to any tab in the
list.

I understand that may be too much of a change to lower level tab widgets? If
that change cannot easily be made, the garbage text to the terminal must be
prevented.

Other information: