Bug 33550 [Dialogs] Dialog should support remembering size and position
There are several dialogs that remember its size and position. Since restore the size and considering screen size and font changes isn't trivial JFace's Dialog class should support remembering and restoring size and position. These would realy ease the task for subclasses. May be you can steel the code from OpenTypeSelectionDialog.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/ResourceListSelectionDialog.java
/**
     * Creates the contents of this dialog, initializes the
     * listener and the update thread.
     * 
     * @param parent parent to create the dialog widgets in
     */
    protected Control createDialogArea(Composite parent) {
		retrieveDialogSettings();
		
        Composite dialogArea = (Composite) super.createDialogArea(parent);
        Label l = new Label(dialogArea, SWT.NONE);
        l.setText(IDEWorkbenchMessages.ResourceSelectionDialog_label);
        GridData data = new GridData(GridData.FILL_HORIZONTAL);
        l.setLayoutData(data);
        pattern = new Text(dialogArea, SWT.SINGLE | SWT.BORDER);
        pattern.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        l = new Label(dialogArea, SWT.NONE);
        l.setText(IDEWorkbenchMessages.ResourceSelectionDialog_matching);
        data = new GridData(GridData.FILL_HORIZONTAL);
        l.setLayoutData(data);
        resourceNames = new Table(dialogArea, SWT.SINGLE | SWT.BORDER
                | SWT.V_SCROLL);
        data = new GridData(GridData.FILL_BOTH);
        data.heightHint = 12 * resourceNames.getItemHeight();
        resourceNames.setLayoutData(data);
        l = new Label(dialogArea, SWT.NONE);
        l.setText(IDEWorkbenchMessages.ResourceSelectionDialog_folders);
        data = new GridData(GridData.FILL_HORIZONTAL);
        l.setLayoutData(data);
        folderNames = new Table(dialogArea, SWT.SINGLE | SWT.BORDER