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This attempts to hack around window-deactivation events we get as a
result of window-manager shortcuts (e.g. increase/decrease volume).
It takes advantage of the fact that window-manager shortcuts are not
exposed to us. If that ever gets fixed, we can presumably modify this
hack.

#26

braille: fail initialization if device is not plugged yet

See merge request !29

We would like to make brltty accept connection but return 0-size in that
case, so screen readers and alike know that brltty is available, but
doesn't have a braille display plugged in yet.

braille: on initialization error, make sure to clean BrlAPI connection

See merge request !28

This reverts commit bc313b70.

Also remove ROLE_LIST from the list of form field roles. We had that in
place for when Firefox neglected to use the correct role for listboxes.
Since that Firefox bug is fixed, we no longer need this hack.

braille: Fix typo

See merge request !26

braille: make sure the attribute mask is as long as the text string

See merge request !25