[TextField] fix textarea maxRows

[loujiayu]

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Limit the number of lines user is abel to enter in textarea.
#4276

[oliviertassinari]

From my point of view rowsMax is here to limit the number of displayed rows, not to limite the actual numbers of rows. I would use another property for this.

Actually, I'm not even sure that we should add this behavior to the core of the TextField. You could easily extend it.

[nathanmarks]

Yeah, that's what this property is for. If you want to limit input you should limit the # of characters in your own application rather than line count.