D17080: Make it possible to fallback to a different icon

[Aleix Pol Gonzalez]

apol created this revision.
apol added a reviewer: Kirigami.
Herald added a project: Kirigami.
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REVISION SUMMARY
  If we failed to download something, it could make sense to be in control of what
  icon is shown instead.

TEST PLAN
  See D17079 <https://phabricator.kde.org/D17079>

REPOSITORY
  R169 Kirigami

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17080

AFFECTED FILES
  src/controls/GlobalDrawer.qml
  src/desktopicon.cpp
  src/desktopicon.h

To: apol, #kirigami
Cc: plasma-devel, dkardarakos, apol, davidedmundson, mart, hein
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