firstVisibleLine
Type: Integer[4]
Availability:
The firstVisibleLine property of the JadeTextEdit control contains the number of the first line that is visible in the client area of the text editor, in the range 1 through the value of the lineCount property.
Setting the value outside of the range 1 through the value of the lineCount property results in the value of the firstVisibleLine property being capped to that range.