Softkeys:In landscape mode, the combox window can not be showed completely.

How to reproduce:
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1. Install all the needed Qt-related libaries then install the fluidlauncher sis package.
2. Launch the Softkeys application in landscape mode.
3. Tap combo box button to show three selections.

Expected result:
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Three selections were showed completely.

Actual result:
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Three selections were not showed completely.

In private JIRA:https://qtrequirements.troll.no/browse/QT-5210