Samegame: Player's score information is shown several times

Reproduction Steps:
1. execute samegame using qmlviewer
2. click [New Game] to start the game
3. play the game to end
4. enter you name in the promot editbox
5. quickly click the prompt box to display player's score information by two or more times

Expected Result: player's score information is shown only once
Actual Result: if you quickly click twice, player's score information is shown twice.
if you quickly click three times, player's score information is shown three times.

Detail information refer to https://qtrequirements.troll.no/browse/QT-4644