Nothing. That's legal. Annoying, but legal. After this happens once or twice (I would imagine once), the player will usually be instructed to count out his chips next to his cards (not in the pot) or to announce the size of his bet before moving chips into the pot.
*Some casinos use a "line" (and actual oval drawn on the table in front of all the players) to avoid this sort of problem. Once a chip crosses the line, it can not go back to your stack. If you reach out with your entire stack in your hand and drop off two $5 chips to call a $10 bet, they will say that your entire stack must stay in the middle. That's your bet. This is the exception and not the rule, and it's stupid IMO. That's why I didn't bring it up until now. But there are some places like this.
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