Bug 220767 [Dialogs] PopupDialog's HOVER_SHELLSTYLE should use SWT.TOOL
3.3.x and 3.4 M5. The SWT.TOOL flag should be used to create hover style shells, hence the PopupDialog's HOVER_SHELLSTYLE should use SWT.TOOL.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/PopupDialog.java
if (takeFocusOnOpen) {
			shell.open();
			getFocusControl().setFocus();
		} else {
			shell.setVisible(true);
		}
		return OK;
	}
	/**
	 * Closes this window, disposes its shell, and removes this window from its
	 * window manager (if it has one).
	 * <p>
	 * This method is extended to save the dialog bounds and initialize widget
	 * state so that the widgets can be recreated if the dialog is reopened.
	 * This method may be extended (<code>super.close</code> must be called).
	 * </p>
	 * 
	 * @return <code>true</code> if the window is (or was already) closed, and
	 *         <code>false</code> if it is still open
	 */
	public boolean close() {
		
		
		if (getShell() == null || getShell().isDisposed()) {
			return true;
		}
		saveDialogBounds(getShell());