Bug 80608 SWT.error does not initialize the causing exception.
SWTException stores the "cause" exception in a public field named "throwable". This prevents access to the causing exception in a standard way, the Exception.getCause method. SWT.error should call initCause to set this up.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/InternalErrorDialog.java
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package org.eclipse.ui.internal.ide.dialogs;
import java.io.ByteArrayOutputStream;