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
if (e.type == SWT.KeyDown) {
							
							e.doit = false;
						}
						break;
					case SWT.PAGE_DOWN:
						newSelection += visibleRows;
						if (newSelection >= proposalTable.getItemCount()) {
							newSelection = proposalTable.getItemCount() - 1;
						}
						if (e.type == SWT.KeyDown) {
							
							e.doit = false;
						}
						break;
					case SWT.PAGE_UP:
						newSelection -= visibleRows;
						if (newSelection < 0) {
							newSelection = 0;
						}
						if (e.type == SWT.KeyDown) {
							
							e.doit = false;
						}
						break;
					case SWT.HOME:
						newSelection = 0;
						if (e.type == SWT.KeyDown) {