Bug 125955 [Field Assist] - StringIndexOutOfBoundsException when backspacing out of a filter
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
.getItemHeight()) - 1;
					switch (e.keyCode) {
					case SWT.ARROW_UP:
						newSelection -= 1;
						if (newSelection < 0)
							newSelection = proposalTable.getItemCount() - 1;
						break;
					case SWT.ARROW_DOWN:
						newSelection += 1;
						if (newSelection > proposalTable.getItemCount() - 1)
							newSelection = 0;
						break;
					case SWT.PAGE_DOWN:
						newSelection += visibleRows;
						if (newSelection >= proposalTable.getItemCount())
							newSelection = proposalTable.getItemCount() - 1;
						break;
					case SWT.PAGE_UP:
						newSelection -= visibleRows;
						if (newSelection < 0)
							newSelection = 0;
						break;
					case SWT.HOME:
						newSelection = 0;
						break;
					case SWT.END:
						newSelection = proposalTable.getItemCount() - 1;
						break;