BUGFIX: Show virtual pages in virtual page tree select field (so that you can select their children), but ignore any attempts to set the tree select field to a virtual page when saving. (by sminnee, merged from r100638)
BUGFIX: Show virtual pages in virtual page tree select field (so that you can select their children), but ignore any attempts to set the tree select field to a virtual page when saving. (by sminnee, merged from r100638)

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