Bug 125955 [Field Assist] - StringIndexOutOfBoundsException when backspacing out of a filter
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
}
		/*
		 * The listener installed on the target control.
		 */
		private Listener targetControlListener;
		/*
		 * The table used to show the list of proposals.
		 */
		private Table proposalTable;
		/*
		 * The proposals to be shown (cached to avoid repeated requests).
		 */
		private IContentProposal[] proposals;
		/*
		 * Secondary popup used to show detailed information about the selected
		 * proposal..
		 */
		private InfoPopupDialog infoPopup;
		/*
		 * Filter text - tracked while popup is open, only if we are told to
		 * filter
		 */
		private String filterText = EMPTY;
		/*
		 * Boolean that indicates whether we are filtering.
		 */
		private boolean filter = false;
		/**
		 * Constructs a new instance of this popup, specifying the control for
		 * which this popup is showing content, and how the proposals should be