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.jface/src/org/eclipse/jface/dialogs/Dialog.java
* 
     * @param button
     */
    protected void setButtonLayoutData(Button button) {
        GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
        int widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
        Point minSize = button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true);
        data.widthHint = Math.max(widthHint, minSize.x);
        button.setLayoutData(data);
    }
    /**
     * Set the layout data of the button to a FormData with appropriate heights
     * and widths.
     * 
     * @param button
     */
    protected void setButtonLayoutFormData(Button button) {
        FormData data = new FormData();
		int widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
		Point minSize = button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true);
		data.width = Math.max(widthHint, minSize.x);
		button.setLayoutData(data);
    }
    /**
	 * @see org.eclipse.jface.window.Window#close()
	 */
    public boolean close() {
        boolean returnValue = super.close();
        if (returnValue) {
            buttons = new HashMap();