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[Marco Trevisan (Treviño) <mail@xxxxxxxxx>]

** Changed in: unity
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1380320

Title:
  [REGRESSION] touchpad behavior broken: left button press delayed if
  finger is on touchpad

Status in Unity:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  This is a REGRESSION. This used to work fine. I don't know when
  exactly it broke.

  Steps to reproduce: Test 1 and Test 2 should both behave the same as
  test 2, but test 1 gives nonsense and dangerous results.

  --Test 1--
  - place finger 1  on the touchpad
  - move the finger around while keeping it in contact with the touchpad => the mouse cursor moves around as expected
  - with another finger 2, press the left button and hold it, while finger 1 is still on the touchpad, at point "A"
  - (*) move finger 1 around on the touchpad to some other point B, then stop moving it
  - move finger 1 around again, to point C
  - only then, release the left button

  -- Test 2 --
  - place finger 1 on the touchpad
  - move the finger around as in test 1
  - take finger 1 away from the touchpad, leaving the cursor at point A
  - with another finger 2, press the left button and hold it
  - place finger 1 on the touchpad again and move it around, then stop at  point B.
  - Move finger 1 a bit more, to point C
  - release the left button

  Expected result:
  OBVIOUSLY, in both cases, the behavior should be the same. A left button press should be registered at point A, then a drag movement to B and then C, and then a button release. If, for example, at point A you hit something draggable, the result is that you drag it and drop to point C

  Observed result:
  Test 2 behaves as expected
  However, in test 1, nothing happens when you actually press the button. Instead, a button press is registered when finger 1 pauses at point B. That is, everything behaves as if you had pressed the mouse button at a completely different place and time than you did. The result is dragging from point B to point C.

  The consequences can be disastrous. This can lead to data loss,
  because a click may be registered on a button that delete things, or
  the drag-and-move operation that is executed (completely unrelated to
  the real action of the user) may be that of moving an object to a
  place where you're not supposed to move it (e.g. moving a file to the
  trash or whatever).

  This can literally  result in formatting your hard drive.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.2+14.04.20140714-0ubuntu1.1
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Sun Oct 12 17:17:03 2014
  InstallationDate: Installed on 2013-10-11 (365 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2014-05-24 (140 days ago)

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