D19857: [DownloadJob] Report total size only if known

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  In case the download size isn't known, the browser reports `-1`

TEST PLAN
  It now shows "xyz MiB of 0 B" so we don't handle that in notifications but it's better than -1 B
  Or should I explicitly `setTotalAmount(0)` in this case?

REPOSITORY
  R856 Plasma Browser Integration

REVISION DETAIL
  https://phabricator.kde.org/D19857

AFFECTED FILES
  host/downloadjob.cpp

To: broulik, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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