[Bug 667802] Re: Tap is sometimes not registered on touchscreens

[Henrik Rydberg]

debb1046, just to make sure - we have a second patch judged too complex
for the SRU. If you can apply and test it, does it make any different
for you?

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Tap is sometimes not registered on touchscreens
https://bugs.launchpad.net/bugs/667802
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Status in uTouch-grail: New

Bug description:
Vincent Gerris wrote on 2010-10-04 (from #637106):

What happens is, that if I touch the screen, the cursor does not move from the previous position sometimes.
For example when I touch 6 different places on the screen, the cursor would follow 3 times and the other 3 not (it would remain at the 3rd position).

Things that effect this: when I press harder on the screen, sometimes the cursor does appear on that spot.
When I touch and then drag, the cursor always follows.

This is a confirmed problem, and a patch for it is on its way.

TEST CASE: Visible on touchscreens. Move a single finger around the screen, and tap lightly with a few seconds interval. The pointer will follow sometimes, and sometimes it will not. With the patch, the pointer will follow every time.