Bug 148357 [Field Assist] - API - provide access for closing the proposal popup
I think that the field assist API needs more hooks to be customizable. For example : 1) There is no way to manually close/open the popup. Most of the times, this is the easier thing for a user to ask to implement his custom behaviour. 2) There is no way to intercept keystrokes/events directed to the field. 3) There is no way to control focus.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
infoPopup.getShell()
													.addDisposeListener(
															new DisposeListener() {
																public void widgetDisposed(
																		DisposeEvent event) {
																	infoPopup = null;
																}
															});
										}
										infoPopup.setContents(p.getDescription());
									} else if (infoPopup != null) {
										infoPopup.close();
									}
									pendingDescriptionUpdate = false;
								}
							}
						});
					}
				};
				Thread t = new Thread(runnable);
				t.start();
			}
		}
		/*
		 * Accept the current proposal.
		 */
		private void acceptCurrentProposal() {