Bug 60415 Should remove Search extension page
I20040428 We should remove the search extension page and should make sure that participants can't damage a search. If a participant generates an exception the participant should be disabled for the rest of the Eclipse sessions. This is consistent with Platform/UI and refactoring.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/JavaSearchPage.java
public boolean isValid() {
		return true;
	}
	
	/**
	 * Creates the page's content.
	 */
	public void createControl(Composite parent) {
		initializeDialogUnits(parent);
		readConfiguration();
		
		GridData gd;
		Composite result= new Composite(parent, SWT.NONE);
		GridLayout layout= new GridLayout(2, false);
		layout.horizontalSpacing= 10;
		result.setLayout(layout);
		result.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		
		RowLayouter layouter= new RowLayouter(layout.numColumns);
		gd= new GridData();
		gd.horizontalAlignment= GridData.FILL;
		gd.verticalAlignment= GridData.VERTICAL_ALIGN_BEGINNING | GridData.VERTICAL_ALIGN_FILL;
	
		layouter.setDefaultGridData(gd, 0);
		layouter.setDefaultGridData(gd, 1);
		layouter.setDefaultSpan();
		layouter.perform(createExpression(result));
		Control searchFor= createSearchFor(result);
		gd= new GridData(GridData.FILL_HORIZONTAL);
		gd.verticalAlignment= GridData.FILL;