keyseq: add test for repeat-shift-repeat-unshift-repeat e.g. hhhhhHHHHHHHhhhhhh with shift down and up in the middle. Unfortunately trying a quick test with test/interactive is not possible because the evdev soft-repeat stops the repeat when another key is pressed. So you need real soft-repeat for that. Signed-off-by: Ran Benita <ran234@gmail.com>