向SourceView增加垂直行号标注
// 设置垂直行号标注CompositeRuler ruler = new CompositeRuler();LineNumberRulerColumn lineCol = new LineNumberRulerColumn();lineCol.setBackground(parent.getShell().getDisplay().getSystemColor(SWT.COLOR_GRAY));ruler.addDecorator(0, lineCol);sourceViewer = new SourceViewer(topComp, ruler, SWT.V_SCROLL | SWT.H_SCROLL );
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