Bug#529459: It does not seem to rename the file

[Dominique Brazziel]

	It seems that this problem stems from iceweasel
not renaming the downloaded playlist (.m3u) from 
'tmpname.m3u.part' to 'playlist.m3u'.  This is 100%
reproducible in the case of using package 
'libapache2-mod-musicindex' and selecting only one or
a few files, then 'Play selected'.  The m3u playlist
is built and downloaded but iceweasel thinks it is only
a partial playlist and thus never performs a rename.
Since iceweasel never sees a file with the .m3u extension
it prompts for an application to handle the file.  

	When I say to stream an entire directory the 
playlist is much larger and the rename is done.  I 
attached strace output for both instances (.trace files).

	I traced the HTTP flow with wireshark and noticed that
the 'Content Disposition' hint is not present in the
small playlist, while the larger list contains the 
'filename=playlist.m3u' hint.  At first I thought
that was the problem but then tested a single file
playlist with epiphany and had no problem.  Wireshark
traces are attached as '.pcap' files.

	Might there be a size threshold (i.e. 8192, 16384)
which iceweasel is using to decide if the download is finished
or not?
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