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
POPUP_MINIMUM_WIDTH);
				proposalTable.setLayoutData(data);
				getShell().pack();
				popupSize = getShell().getSize();
			}
			
			
			Rectangle constrainedBounds = getConstrainedShellBounds(new Rectangle(initialX, initialY, popupSize.x, popupSize.y));
			
			 
			
			if (constrainedBounds.y < initialY)
				getShell().setBounds(initialX, location.y - popupSize.y, popupSize.x, popupSize.y);
			else
				getShell().setBounds(initialX, initialY, popupSize.x, popupSize.y);
			
			getShell().addListener(SWT.Resize, new Listener() {
				public void handleEvent(Event e) {
					popupSize = getShell().getSize();
					if (infoPopup != null) {
						infoPopup.adjustBounds();
					}
				}
			});
		}
		/*
		 * Handle the set data event. Set the item data of the requested item to
		 * the corresponding proposal in the proposal cache.
		 */
		private void handleSetData(Event event) {