CaretPositionTest will get different caret position for unvalid surrogate pair on solaris and linux

JDK : any 7 promotion build
Tested on Solaris 10 and RHAS 4

Running Supplementary Swing Textcase - CaretPositionTest gets inconsistent caret position from solaris and linux. I think swing toolkit handles cusor differently for invalid surrogate \ud800\ud802 on solaris and rhas. The cursor will skip \ud800\ud802 to the next valid character on rhas, but will stop at \ud800 on solaris.