id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
56	Fix SWTException during scrolling	Fabian Rohn	Fabian Rohn	"Sometimes I reported some Exceptions, I could not reproduce. Now I believe I got it.

To reproduce it, you have to do the following steps:
- insert some tiles (straights and 60° turns)
- click with the left mouse button on a scroll item of the widget and hold it
- scroll a bit and move the mouse away from scroll item (by holding the mouse button)
- then the exeption occurs

Here the stacktrace:

{{{
12:31:44,406 ERROR unknown:42 - Failed to execute runnable (java.lang.NullPointerException)
org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException)
	at org.eclipse.swt.SWT.error(SWT.java:3773)
	at org.eclipse.swt.SWT.error(SWT.java:3691)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3759)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3384)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2394)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2358)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2210)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:494)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:489)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at de.jacavi.rcp.Application.start(Application.java:25)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:379)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1212)
Caused by: java.lang.NullPointerException
	at de.jacavi.rcp.widgets.TrackWidget.handleInnerControlClick(TrackWidget.java:477)
	at de.jacavi.rcp.widgets.TrackWidget.access$3(TrackWidget.java:476)
	at de.jacavi.rcp.widgets.TrackWidget$ClickEventRepetitionHandler$1.run(TrackWidget.java:239)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	... 23 more
}}}
"	defect	closed	critical	MS1: First release (1.0.0)	track	pre-1.0	fixed	SWTException