Edge: ConcurrentModificationException during shutdown

[HeikoKlare]

When multiple Edge instances are open when closing an application, a concurrent modification exeception occurs (as the Edge instance is removed from the list of instances while iterating through it):

java.util.ConcurrentModificationException
	at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1095)
	at java.base/java.util.ArrayList$Itr.next(ArrayList.java:1049)
	at org.eclipse.swt.browser.Edge.lambda$12(Edge.java:554)
	at org.eclipse.swt.widgets.Display.release(Display.java:3779)
	at org.eclipse.swt.graphics.Device.dispose(Device.java:339)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:194)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:143)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:109)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:439)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:271)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:668)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:605)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1481)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1454)