[Installit-dev] Download wizard problems

[Jannis Pohlmann]

Hey Benny,

I tried to improve the responsiveness of the download wizard today.
During this, I noticed something very annoying: It is impossible to
cancel downloads. This hasn't been introduced with any version, it's
always been there!

The 'urllib' module allows for hooking into the download process.
However, it's a non-async transfer which makes it hard to avoid a
blocked user interface. 

Do you have any ideas on how this could be solved perhaps? I don't know
much about threaded programming, subprocesses and glib/gobject/gtk main
loops, but perhaps you do.

Thanks in advance,
Jannis
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