Bug 262022 [FieldAssist] ContentProposalAdapter.recomputeProposals might throw a NPE
When a control using content proposal gets disposed during usage the recomputeProposals() method might throw a NPE. This is caused by getting "allProposals" using a call to getProposals() which is allowed to return null. When using allProposals.length this will crash. I'm not sure if the simple solution if ((allProposals == null) || (allProposals.length == 0) { proposals = new IContentProposal[0]; close(); } else { // cont. will work or if the popup will have problems with a disposed control.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
e.doit = true;
				} else {
					
					
					e.doit = propagateKeys;
				}
				
				if (key == 0) {
					int newSelection = proposalTable.getSelectionIndex();
					int visibleRows = (proposalTable.getSize().y / proposalTable
							.getItemHeight()) - 1;
					switch (e.keyCode) {
					case SWT.ARROW_UP:
						newSelection -= 1;
						if (newSelection < 0) {
							newSelection = proposalTable.getItemCount() - 1;
						}
						
						
						if (e.type == SWT.KeyDown) {
							
							e.doit = false;
						}
						break;
					case SWT.ARROW_DOWN:
						newSelection += 1;
						if (newSelection > proposalTable.getItemCount() - 1) {
							newSelection = 0;
						}