Bug 262022 [FieldAssist] ContentProposalAdapter.recomputeProposals might throw a NPE
When a control using content proposal gets disposed during usage the recomputeProposals() method might throw a NPE. This is caused by getting "allProposals" using a call to getProposals() which is allowed to return null. When using allProposals.length this will crash. I'm not sure if the simple solution if ((allProposals == null) || (allProposals.length == 0) { proposals = new IContentProposal[0]; close(); } else { // cont. will work or if the popup will have problems with a disposed control.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
IContentProposal p = getSelectedProposal();
								if (p != null) {
									String description = p.getDescription();
									if (description != null) {
										if (infoPopup == null) {
											infoPopup = new InfoPopupDialog(
													getShell());
											infoPopup.open();
											infoPopup
													.getShell()
													.addDisposeListener(
															new DisposeListener() {
																public void widgetDisposed(
																		DisposeEvent event) {
																	infoPopup = null;
																}
															});
										}
										infoPopup.setContents(p
												.getDescription());
									} else if (infoPopup != null) {
										infoPopup.close();
									}
									pendingDescriptionUpdate = false;
								}
							}
						});
					}
				};