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
getSystemColor(SWT.COLOR_INFO_FOREGROUND);
			}
			
			/*
			 * (non-Javadoc)
			 * @see org.eclipse.jface.dialogs.PopupDialog#getBackground()
			 */
			protected Color getBackground() {
				return control.getDisplay().
						getSystemColor(SWT.COLOR_INFO_BACKGROUND);
			}
			/*
			 * Set the text contents of the popup.
			 */
			void setContents(String newContents) {
				if (newContents == null) {
					newContents = EMPTY;
				}
				this.contents = newContents;
				if (text != null && !text.isDisposed()) {
					text.setText(contents);
				}
			}
			/*
			 * Return whether the popup has focus.
			 */
			boolean hasFocus() {
				if (text == null || text.isDisposed()) {
					return false;
				}