formatEditorSelection indents regions outside selected

[pierslawrence]

When using MBeautify.formatEditorSelection(), after formatting the selected text, MBeautify.m#L227 then indents the entire editor page, rather than just the selection. I.e. the following code is called:

            MBeautify.indentPage(currentEditorPage, configuration);

It would seem more appropriate to indent only the selected region.