[Kget] [Bug 295467] New: Add option to resume download if already exists

[Ray Rashif]

https://bugs.kde.org/show_bug.cgi?id=295467

            Bug ID: 295467
          Severity: normal
           Version: unspecified
          Priority: NOR
          Assignee: kget at kde.org
           Summary: Add option to resume download if already exists
    Classification: Unclassified
                OS: Linux
          Reporter: schiv at archlinux.org
          Hardware: Archlinux Packages
            Status: UNCONFIRMED
         Component: general
           Product: kget

If a URL has an expiration time, or if one simply wishes to download the same
file from another location due to speed constraints on one server, or other
reasons, then there is no current possibility to continue the download.

Whenever a second file (with the same name) is passed, KGet asks if we want to
restart the download. There should be an option to "resume" or "continue" the
download, in addition to simply restarting.

This should work in two ways:

1. If a download already exists in KGet (but stopped), it should continue the
download as per normal, with all settings including multipart (the resume
should also be multipart).

2. However, if a download is new in the list but the file already exists on the
filesystem, multipart should be disabled for that resume, so as to not corrupt
the file in the event the partial file was a leftover of another multipart
download manager.

If the file was downloaded with another download manager, it will not be KGet's
fault if it was part of a threaded (multipart) download. The resulting file
will simply be corrupted in that case. In other words, no download manager
worth its salt should leave a partial multipart file as if it was a normal
download (it should be split into many files).

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