Bug 110087 [Markers] "Filters" menu doesn't remember the last selected filter
When I was playing with this it was a true pain. I'd change somes ettings to see what effect it had and then re-open the dialog to try some other settings I had to re-select my filter (it selects the first one always)...
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/FiltersConfigurationDialog.java
removeButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				removeFilters(filtersList.getSelection());
			}
		});
		setButtonLayoutData(removeButton);
		Button andButton = new Button(filtersComposite, SWT.RADIO);
		GridData data = new GridData(GridData.FILL_HORIZONTAL, SWT.NONE, true,
				false);
		data.horizontalSpan = 2;
		andButton.setLayoutData(data);
		andButton.setText(MarkerMessages.AND_Title);
		andButton.setSelection(andFilters);
		andButton.addSelectionListener(new SelectionAdapter() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent)
			 */
			public void widgetSelected(SelectionEvent e) {
				andFilters = true;
			}
		});
		Button orButton = new Button(filtersComposite, SWT.RADIO);
		data = new GridData(GridData.FILL_HORIZONTAL, SWT.NONE, true, false);
		data.horizontalSpan = 2;
		orButton.setLayoutData(data);
		orButton.setText(MarkerMessages.OR_Title);
		orButton.setSelection(!andFilters);
		orButton.addSelectionListener(new SelectionAdapter() {