messes up with dconf settings even when the user didn't change anything

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What steps will reproduce the problem?
  0) start dconf-editor
  1) reset all gnome-mplayer/gecko-mediaplayer preferences to their defaults
  2) quit dconf-editor
  3) start gnome-mplayer
  4) enter its preferences dialog window and just take a look around
     (without changing anything)
  5) exit from the dialog window
  6) quit gnome-mplayer
  7) start dconf-editor

What is the expected output? What do you see instead?
 many settings are again marked as manually-changed (in boldface font),
 even though almost all of these are actually equal to their default
 value; some values are indeed non-default (such as audio-lang, for
 instance).
 I do not experience this awkward behavior, if I skip steps 4 and 5.

What version of the product are you using? On what operating system?
 Debian Jessie - gnome-mplayer version: 1.0.8-1

Please provide any additional information below.
 Debian Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=711118

 gnome-mplayer internal configuration dialog
 window does something strange to ~/.config/dconf/user ...
 I don't think it should save anything to the configuration file, if I
 haven't changed any setting at all! In other words, the configuration
 file should stay absolutely untouched, unless I actually changed
 something.

 And anyway, it should not mark settings as manually-changed, if I
 haven't changed them manually.

 Finally, it should not set some options to non-default values (such as
 audio-lang, for instance), if I haven't done anything to them.

Original issue reported on code.google.com by rossgamm...@gmail.com on 10 May 2015 at 6:26