[Bugs] #4068 sugar-toolkit-gtk3 HIGH: Hidden cursor can have an action

[Sugar Labs Bugs]

#4068: Hidden cursor can have an action
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    Reporter:  erikos              |          Owner:  erikos  
        Type:  defect              |         Status:  new     
    Priority:  High                |      Milestone:  0.98    
   Component:  sugar-toolkit-gtk3  |        Version:  0.97.x  
    Severity:  Major               |       Keywords:          
Distribution:  OLPC                |   Status_field:  Assigned
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Comment(by dsd):

 There is some weird interaction with the mouse cursor and the touchscreen.

 In Sugar, playing on an empty group view (I have no friends), I do the
 following:
  1. As preparation, use the touchpad to position the mouse cursor
 somewhere on the left half of the screen
  2. Briefly touch somewhere on the right side of the screen
  3. Use the touchpad to move the cursor very slightly
  4. Briefly touch somewhere on the left side of the screen
  5. Use the touchpad to move the cursor very slightly
  6. Repeat steps 2 through 5 until bored

 The result is that touching the screen always moves the mouse cursor to
 the location of the touch (you can't see it, but move the mouse slightly
 and you'll find its new location).

 Now, in GNOME:

  1. Start GNOME, wait for it to load, don't touch any input devices. Note
 that the mouse pointer is in the centre of the screen.
  2. Touch the screen somewhere on the right hand side.
  3. Use the touchpad to move the cursor very slightly

 You'll notice that the mouse cursor jumps to the touch point when you
 execute number 3, just like Sugar. But now keep playing:

  1. Touch the screen somewhere on the left side
  2. Use the touchpad to move the cursor very slightly
  3. Repeat 1 and 2 until bored

 Now we are seeing different behaviour. Touching the screen does *not*
 affect the position of the mouse cursor like the previous tests.

 But when you open a GNOME app or two and start tapping in and out of
 windows, we lose that behaviour.

 Having trouble getting my head around what kind of behaviour we want here,
 and if it relates to this bug.

-- 
Ticket URL: <http://bugs.sugarlabs.org/ticket/4068#comment:2>
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