evince remembers the window position, but it appears that the window
is sometimes slightly shifted. Apparently it always occurs when:
1. opening a file
2. moving or resizing the window [position 2]
3. quitting
4. reopening [position 4]
i.e. position 2 and position 4 are different.

This occurs at least with fvwm. The bug is very similar to

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=649132

which occurs for one of the GnuCash windows (its main window is not
affected by this problem), at least with fvwm and twm.

It seems that the shift more or less corresponds to the left window
border (horizontal shift to the right) and to the top window border
+ height of the window title (vertical shift to the bottom).