Hide the page bar based on group
Do export and Slideshow not have permissions? Maybe not, and even then you can get left with a more button with nothing on it (so actually a bug).
I usually do this sort of thing (for page actions usually) with some custom css and enable the layout_add_body_group_class
pref, so you can do something like:
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.wikiactions_wrapper, .wikitopline { display: none; } .grp_Registered .wikiactions_wrapper, .grp_Registered .wikitopline { display: inherit; }