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
infoPopup.open();
										infoPopup.getShell()
												.addDisposeListener(
														new DisposeListener() {
															public void widgetDisposed(
																	DisposeEvent event) {
																infoPopup = null;
															}
														});
									}
									infoPopup.setContents(p.getDescription());
									pendingDescriptionUpdate = false;
								}
							}
						});
					}
				};
				Thread t = new Thread(runnable);
				t.start();
			}
		}
		/*
		 * Accept the current proposal.
		 */
		private void acceptCurrentProposal() {