I want to put a attributed string on a nstextview, and manually calculate the 
height of the textview and row

-(CGFloat)tableView:(NSTableView *)tableView heightOfRow:(NSInteger)row 

inside

-(NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn 
*)tableColumn row:(NSInteger)row 

I update frame of TextView,

textView.frame = CGRectMake(57.0f, 36.0f-height, 380.0f, height); 

height is the calculated result for NSTextView.


everything is fine for the first time, 


but if I scroll, the TextView starts move down, 


it has been bugs me for a day, does anyone knows why? thanks in advance.



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