Bug 250604 [FieldAssist] API - ContentProposalAdapter needs isShowing() method
Please implement a method ContentProposalAdapter.isShwoing(). The method should return a boolean whether the content assistant proposal popup is open or not.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
case SWT.Traverse:
				case SWT.KeyDown:
					if (DEBUG) {
						StringBuffer sb;
						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);
						}
						
						
						
						if (propagateKeys && e.character != 0)