FilteringSelect and ComboBox: Add support for Alt up/down

[ptbrunet]

Alt down/up arrow should open/close the list. This function is missing, but is expected behavior for keyboard users. The autocompleting address bar widgets in IE/FF react to alt up/down. The address bar widget is autocompleting and is the one that is discussed when figuring out how FilteringSelect should work. Another example is the edit combo seen on the run dialog (use Start|Run).

[Becky Gibson]

The behavior Becky would like is:

*when there is a drop down open and the user presses alt-up arrow, the drop down is closed but the value in the input field remains unchanged. If necessary, I could live with the same behavior as escape which closes the drop down and clears out the field.

*when there is NO drop down open and the user presses alt+down arrow the entire list is opened and the value currently within the input field is not changed. Focus stays within the input field until the user presses a down arrow by itself. Yes, it defeats the purpose of filtering but this is the behavior keyboard and screen reader users expect, the full list is displayed when alt+down arrow is pressed.

[Chris Mitchell]

reassign due to inactive committer. please triage accordingly.

[ben hockey]

bill,

this behavior does not exist but i assume we would like to keep this ticket open to consider adding the option? if not, we should close the ticket.

[bill]

Yeah, Becky says that Alt up/down is the standard way to open the drop down for an HTML select (although I wonder why, since plain up/down seems easier). So we should implement it I think (for FilteringSelect/ComboBox and Select).

[dylan]

A pull request would be welcome for this if it is still an issue, but given the lack of activity over the past 5+ years, I'm closing this one.