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
*         <code>FILTER_NONE</code>.
	 */
	public int getFilterStyle() {
		return filterStyle;
	}
	/**
	 * Set the integer style that indicates how keystrokes affect the content of
	 * the proposal popup while it is open. Popup-based filtering is useful for
	 * narrowing and navigating the list of proposals provided once the popup is
	 * open. Filtering of the proposals will occur even when the control content
	 * is not affected by user typing. Note that automatic filtering is not used
	 * to achieve content-sensitive filtering such as auto-completion. Filtering
	 * that is sensitive to changes in the control content should be performed
	 * by the supplied {@link IContentProposalProvider}.
	 * 
	 * @param filterStyle
	 *            a constant indicating how keystrokes received in the proposal
	 *            popup affect filtering of the proposals shown.
	 *            <code>FILTER_NONE</code> specifies that no automatic
	 *            filtering of the content proposal list will occur as keys are
	 *            typed in the popup. <code>FILTER_CHARACTER</code> specifies
	 *            that the content of the popup will be filtered by the most
	 *            recently typed character. <code>FILTER_CUMULATIVE</code> is
	 *            deprecated and no longer recommended. It specifies that the
	 *            content of the popup will be filtered by a string containing
	 *            all the characters typed since the popup has been open.
	 */
	public void setFilterStyle(int filterStyle) {
		this.filterStyle = filterStyle;
	}