Bug 125418 [Field Assist] - API - Should ContentProposalPopup be public?
In the initial release of the field assist API, the ContentProposalPopup is public. There's really no reason for this to be the case, as the popup is driven by the ContentProposalAdapter. The ContentProposalPopup should likely be made an inner type of the adapter.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalPopup.java
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() {
		adapter.proposalAccepted(getSelectedProposal());
		close();
	}