Bug 127080 [Field Assist] widget disposed error on proposal insertion
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
if (p != null) {
									if (infoPopup == null) {
										infoPopup = new InfoPopupDialog(
												getShell());
										infoPopup.open();
									}
									infoPopup.setContents(p.getDescription());
									infoPopup.getShell().addDisposeListener(
											new DisposeListener() {
												public void widgetDisposed(
														DisposeEvent event) {
													infoPopup = null;
												}
											});
								}
							}
						});
					}
				};
				Thread t = new Thread(runnable);
				t.start();
			} else if (infoPopup != null) {
				
				infoPopup.setContents(description);
			}
		}
		/*
		 * Accept the current proposal.
		 */
		private void acceptCurrentProposal() {