Finger paint: can't paint in landscape mode if the application is launched in portrait mode.

Reproduce steps:

1) Compile the examples\touch\fingerpaint from Qt libs.
2) Install and launch the application in portrait mode.
3) Paint anything at drawing area.
4) Rotate the device to landscape mode.
5) Rotate the device back to portrait mode.

Expected result:
Can paint on drawing area, no matter launch the application in portrait mode or landscae mode.

Actual result:
If launch the application in landscape mode, the application works well.
If launch the application in portrait mode, the application doesn't work on landscape mode. The painting is disappeared while changing the mode from portrait to landscape.

See more information from private JIRA: https://qtrequirements.troll.no/browse/QTTH-1099