[doc_spec]: improve tests for doc property table in submenu

[duncdrum]

right clicking on a document opens a menu with two tables properties and permissions. Their structure depends on the filetype being checked.

Within our testsuite it dom instabilities can lead to selection of the wrong filetype for which to display the properties.
we need to a) make it harder to select the wrong filetype for the rightclick and b) improve the tests for those tables to ensure all the relevant entries per file-type are actually displayed.

This is most easily revealed by repeated runs. with the occasional aborted run thrown into the mix