At the moment it can happen that even though a member is found in the
currently edited file, the search at the end of the function finds
the type inside another file. This typically happens for anonymous
structs so e.g. for anon_struct_0{...} from the current file we get
members from anon_struct_0{...} from all open documents plus gloabl tags.
Search in an increasing "circle" - start with current file only (trying
all possible types of the variable), continue with workspace array and
finally, if not found, search in the global tags.
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