Bug 147377 [Field Assist] - open proposal popup should close when there are no valid proposals left
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
default:
						if (e.keyCode != SWT.CAPS_LOCK && e.keyCode != SWT.MOD1
								&& e.keyCode != SWT.MOD2
								&& e.keyCode != SWT.MOD3
								&& e.keyCode != SWT.MOD4) {
							close();
						}
						return;
					}
					
					
					if (newSelection >= 0) {
						selectProposal(newSelection);
					}
					return;
				}
				
				
				
				switch (key) {
				case SWT.ESC:
					e.doit = false;
					close();
					break;
				case SWT.LF:
				case SWT.CR:
					e.doit = false;
					Object p = getSelectedProposal();
					if (p != null) {