Filenames with spaces get their names truncated when downloading from summary/preview panel

What steps will reproduce the problem?
1. Upload an item with one or more spaces in its file name.
2. Select that item.
3. Go to the summary/preview panel at the right.
4. Try to download any of the renditions clicking on the diskette icon.

What is the expected output? What do you see instead?
The expected output is to download a file whose file name similar to the 
original uploaded but with the the rendition name appended.
Instead the name of the downloaded file include only the portion until the 
first space in the uploaded file name. There is no extension also.

For example:
You upload a file named "Screenshot 2013-04-11 10:31:51.png".
The download file gets the name "Screenshot".

What version of the product are you using? On what operating system?
changeset:   2063:e39b51446104
branch:      notredam-replacement
os: ubuntu 12.04 amd64

Original issue reported on code.google.com by goo...@gmail.com on 15 Apr 2013 at 8:49

crs4 / notredam

Filenames with spaces get their names truncated when downloading from summary/preview panel #86