Guard visual font setup without graphics context - #23
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getGraphics() can return null before the panel has a graphics context. Keep the existing default-font fallback by only applying visual styles when a Graphics2D is available.
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TreePanelusesgetGraphics()while calculating text width for tree rendering. Swing can returnnullfromComponent.getGraphics()before a component has a graphics context. This guard keeps the existing default-font fallback in that case.