This makes move_download not assume that there is a connection attached
when it is called. This is the case pretty often for file:// downloads when
dialogs are involved (query file) and the reason why it explicitly checks
if the connection state is 'in result state'. Anyway, fill the new download
struct with variabled from the old one instead of taking variables from the
connection struct.
This patch also adds some assertions and a few comments.
This includes setting the new priority and adding the download to the list
of connection downloads. If the connection has no downloads set the
PRI_CANCEL priority; get_priority() requires that.
This simplifies unqueuing of downloads and makes it more obvious that
the 'change' being performed is to migrate or replace an old download
handle with a new one.
Use enum connection_state instead of int in load_uri,
proxy_uri, get_proxy_worker, and get_proxy_uri. See commit
d18809522e. I hope that satisfies TCC.
Mostly non-ANSI function declarations, using 0 as NULL and inline
function prototypes. Also removed unused S_HTTP_100 network state
enum type, which text message contained unknown escape sequence: '\?'.
