Bug 243612 [FieldAssist] Content assist does not work well with combo box.
To replicate the problem on a combo box with content assist enabled. This can be seen from the SDK Example provided with eclipse. Verified on 3.2-3.4 1. Click on the button to show the drop down list for the combo 2. Click on the editable text field of the combo 3. Initiate content assist on that text field 4. Now when we move the mouse, the focus is on the drop down list of the combo although it is hidden behind the content assist popup. Clicking once will fill the text field of the combo box with the value from the drop down list (which is hidden now). May be the combo box drop down list should close as soon as content assist is in effect?
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
*            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;
	}
	/**
	 * Return the size, in pixels, of the content proposal popup.
	 * 
	 * @return a Point specifying the last width and height, in pixels, of the
	 *         content proposal popup.
	 */
	public Point getPopupSize() {
		return popupSize;
	}
	/**
	 * Set the size, in pixels, of the content proposal popup. This size will be
	 * used the next time the content proposal popup is opened.
	 * 
	 * @param size
	 *            a Point specifying the desired width and height, in pixels, of
	 *            the content proposal popup.
	 */
	public void setPopupSize(Point size) {
		popupSize = size;