"values from namespace" includes redirect pages

[gesinn-it-gea]

A field with "values from namespace" includes redirect pages. This should not be the case.

Steps to reproduce:

• a field with values from namespace=File
• upload a file A.png
• rename the file to B.png

Observation:
Both, A.png and B.png are returned

[krabina]

Furthermore it also includes subpages. This is unfortunate, since "values from namespace" is often use to select users in a form. Now if the user has not only a user page User:Gesinn, but also supages: User:Gesinn/MyTestPage then the autocomplete will also suggest all subpages making the "value from namespace" not usable anymore for selecting users.

[krabina]

Furthermore, displaytitle is ignored. So if User:Gesinn has a displaytitle of "Alexander Gesinn" the form field will show "User:Gesinn" instead of "Alexander Gesinn".