It is not and has never been a “requirement” that “Keyboard focus should
follow tap/ click so that pressing (Shift)Tab moves relative to the
component last interacted with”. That would be highly unpleasant if it
applied, for example, to scrollbars, panel resize handles, or window
resize handles. Unfortunately, because the initial toolkit designers
were focused on touch input, the toolkit specification did not make a
distinction between elements that should be focusable and elements that
should not.
So, Femma has just approved my definition of the three focusability
classes for elements, and it is now part of the specification template
for toolkit elements to define which focusability class it belongs to.
She’s also approved my definition of the three selectability classes for
lists. Making lists non-pointer-selectable by default would make *this*
list non-pointer-selectable, which should mean tapping the list item
will not focus its switch, which should mean that Space does not toggle
the switch, which fixes this bug.
To summarize: When most of your input is with touch, it would be ugly
for most controls to get focus rings — and most list items to look
selected — just because you tapped them and *might* use a keyboard to
navigate through them later. The toolkit currently tries to solve this
by suppressing the focused/selected appearance based on *how* the item
was focused/selected. This has turned out to be mistaken because it
results in surprising behavior if you *do* use a keyboard later. A
better solution is that for many types of control — and items in many
lists — tapping/clicking should not focus/select the control in the
first place.
** Changed in: ubuntu-ux
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1549733
Title:
SystemSettings Language&Text view: hitting Space on HW keyboard
triggers switch even when it (or its list item) does not show any
visual focus frame
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