Bug 47208 Generate Javadoc dialog lays out too wide [javadoc]
If one uses a custom doclet and sets the doclet class path to a long path (e.g. with many JAR files on it), the "Generate Javadoc" dialog lays out to try and fit the full doclet class path on the screen; this results in a very wide dialog.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javadocexport/JavadocTreeWizardPage.java
if (!path.toFile().isFile()) {
					fJavadocStatus.setError(JavadocExportMessages.getString("JavadocTreeWizardPage.javadoccommandfile.error"));  
				}
				updateStatus(findMostSevereStatus());
				break;
		} 
	}
	private boolean validDocletPath(String docletPath) {
		StringTokenizer tokens= new StringTokenizer(docletPath, ";"); 
		while (tokens.hasMoreTokens()) {
			File file= new File(tokens.nextToken());
			if (!file.exists())
				return false;
		}
		return true;
	}
	private boolean showPreferencePage(String id, IPreferencePage page) {
		final IPreferenceNode targetNode = new PreferenceNode(id, page);
		
		PreferenceManager manager = new PreferenceManager();
		manager.addToRoot(targetNode);
		final PreferenceDialog dialog = new PreferenceDialog(getShell(), manager);
		final boolean [] result = new boolean[] { false };
		BusyIndicator.showWhile(getShell().getDisplay(), new Runnable() {
			public void run() {
				dialog.create();
				dialog.setMessage(targetNode.getLabelText());
				result[0]= (dialog.open() == Window.OK);
			}
		});