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
if (e.type == SWT.Traverse) {
							sb = new StringBuffer("Traverse"); 
						} else {
							sb = new StringBuffer("KeyDown"); 
						}
						sb.append(" received by adapter"); 
						dump(sb.toString(), e);
					}
					
					
					if (popup != null) {
						popup.getTargetControlListener().handleEvent(e);
						if (DEBUG) {
							StringBuffer sb;
							if (e.type == SWT.Traverse) {
								sb = new StringBuffer("Traverse"); 
							} else {
								sb = new StringBuffer("KeyDown"); 
							}
							sb.append(" after being handled by popup"); 
							dump(sb.toString(), e);
						}
						return;
					}
					
					if (e.type == SWT.Traverse) {
						return;
					}