#1 Occasional NPE thrown when explorer output is updated

[Aaron Siegel]

Bug report from Michael. I've seen this one occasionally too.

Sometimes when I have a tree of positions and click on an earlier
created one it throws a null pointer exception. This was initially
observed with Lasers, but checked also with Domineering. It's nothing
fatal, i.e. everything still seems to work fine ...

java.lang.NullPointerException
at java.awt.font.TextLine.checkCtorArgs(TextLine.java:117)
at java.awt.font.TextLine.<init>(TextLine.java:108)
at java.awt.font.TextMeasurer.makeTextLineOnRange(TextMeasurer.java:462)
at java.awt.font.TextMeasurer.getLayout(TextMeasurer.java:594)
at java.awt.font.LineBreakMeasurer.nextLayout(LineBreakMeasurer.java:427)
at java.awt.font.LineBreakMeasurer.nextLayout(LineBreakMeasurer.java:395)
at org.cgsuite.lang.output.StyledTextOutput.updateLayouts(StyledTextOutput.java:815)
at org.cgsuite.lang.output.StyledTextOutput.getSize(StyledTextOutput.java:760)
at org.cgsuite.lang.output.OutputBox.recalc(OutputBox.java:244)
at org.cgsuite.lang.output.OutputBox.setWorksheetWidth(OutputBox.java:182)
at org.cgsuite.ui.worksheet.WorksheetPanel.postOutput(WorksheetPanel.java:285)
at org.cgsuite.ui.explorer.ExplorerTopComponent.reeval(ExplorerTopComponent.java:476)
at org.cgsuite.ui.explorer.ExplorerTopComponent.selectionPathChanged(ExplorerTopComponent.java:346)
at org.cgsuite.ui.explorer.ExplorerTreePanel.fireTreeSelectionChanged(ExplorerTreePanel.java:307)
at org.cgsuite.ui.explorer.ExplorerTreePanel.setSelectionPath(ExplorerTreePanel.java:373)
at org.cgsuite.ui.explorer.ExplorerTreePanel$5.mouseClicked(ExplorerTreePanel.java:122)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:252)
at java.awt.Component.processMouseEvent(Component.java:6266)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3255)
at java.awt.Component.processEvent(Component.java:6028)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4247)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148)
[catch] at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)