None of the Emacs-style key combinations is working, they always bring up the "search by typing" search on the first character instead of starting a key combination.
As soon as I type the
G, the search box pops up with a
Gin it (of course)
This only occurs when the option "Search for text when I start typing" in the Advanced > General option panel is enabled.
In Gmail those kind of short-cuts do work even with the option enabled, so it is possible