Add missing-plugins support
@mathias.hasselmann
Submitted by b'Mathias Hasselmann (IRC: tbf)' Assigned to Alessandro Decina @alessandro.d
Description
Try to add some unsupported image WMV movie (see also: Bug T1956).
Expected behavior:
Some dwarf jumps in and silently adds support for that movie format.
Ok, won't happend.
Really expected behavior:
Some error message is shown informing the user that this file is not supported yet.
Current behavior:
Nothing happens. Really nothing. Pure silence.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=541038