Search a substring instead of start of string for rustdoc

[antoyo]

Hi.
Currently, if I search key_press_event rustdoc won't find connect_key_press_event, but connect_key_press will work.
It would be nice to be able to do substring search.
Thanks.

[Mark-Simulacrum]

cc @GuillaumeGomez -- I feel like this behavior is already implemented?

[GuillaumeGomez]

Not really or at least not completely. I'll need to make another pass on it.