Ruling about putting chips in front of one's cards

[Kaeser]

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[quoteEven if this is true, I thought that placing chips less than the amount of the bet into the pot was not necessarily a call, except that you had to forfeit those chips into the pot if you decided not to complete the call.

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Is that a real ruling? (Not completing a call/forfeiting chips) That would be a pretty unusual ruling.

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The local cardroom near me uses this rule for tournaments (any chips past the betting line stay in the pot). Of course they have an actual betting line so it's not as bad.

This seems very open to angle-shooting, especially for players who use chips as card protectors. What if you lift your cards for a peek and your chip slides forward. Can the raiser rule that as a call for the full raise?