Currently, the keyhint window is shown even if the keystring matches no
possible bindings. This causes an empty keyhint window to hang around
after entering hinting mode.
Instead, the window is now hidden if no bindings match the current
keystring.
Resolves#1507.
Change the unit tests to expect the new tabular format.
Also generally clean up the tests -- refactor from a class to
module-level functions as there was no need for a class here.
- validate keyhint text for a partial keychain
- ensure special keybindings are not suggested
- ensure it is not visible when disabled
- ensure changes to the suffix color are picked up
