How should this be possible?
I think the wrong value has to be changed. If it is renamed you will no longer know wich is the new id. Currently the selected view will fall back to folder_listing if the default page is not accessible.
I think this is bad usability.
I didn't make myself clear. I agree with your pull request as a whole. But I think it could be improved by removing lines 1331-1333 and instead make sure the portal root's getDefaultPage method will look at portal.getProperty('default_page', '')
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