scroll
fun JTextPane.scrollTextWithLineNumbers(workbench: AvailWorkbench, guideLines: List<Int> = listOf(80)): JLayer<JScrollPane>
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Either places the receiver JTextArea inside a JScrollPane with line numbers presented as row headers, or answers the JScrollPane that it's already inside.
Return
The requested JLayer.
Parameters
workbench
The owning workbench.
guide
The list of after how many (character) columns to display a guide line. Defaults to a single guideline at 80.