D7438: Also remember which avatars we didn't find

[Volker Krause]

vkrause created this revision.
Restricted Application added a project: KDE PIM.

REVISION SUMMARY
  This massively reduces the amount of network requests, at very little
  disk and memory cost (1Mb per 20+k of missing avatars with both backends,
  60+k for just Gravatar).
  
  It's even more important when having both backends enabled, in that case
  we always did a request for the first backend even if the second one could
  provide it from the local cache.

REPOSITORY
  R88 PIM: Gravatar Library

BRANCH
  pending

REVISION DETAIL
  https://phabricator.kde.org/D7438

AFFECTED FILES
  autotests/gravatarcachetest.cpp
  autotests/gravatarcachetest.h
  autotests/gravatarresolvurljobtest.cpp
  src/CMakeLists.txt
  src/job/gravatarresolvurljob.cpp
  src/job/gravatarresolvurljob.h
  src/misc/gravatarcache.cpp
  src/misc/gravatarcache.h
  src/misc/hash.cpp
  src/misc/hash.h

To: vkrause, #kde_pim
Cc: dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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