Set the filemodel before rending the detailsview

fixes #10934

Else it triggers the rendering two times. Resulting is weird state in
for example the comments. Because the comments for OLD_FILEID are
retrieved but then the model is changed to NEW_FILEID. But the old
comments still get in and get parsed.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>