D16665: Add programmaticaly useful error signalling

[Dan Leinir Turthra Jensen]

leinir created this revision.
leinir added reviewers: KNewStuff, apol.
leinir added a project: KNewStuff.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
leinir requested review of this revision.

REVISION SUMMARY
  Previously, KNSCore only signalled errors using string messages, which were useful for fault finding, but not useful when attempting to handle errors during general operation. This patch adds a signal which is fired at the same time as some error messages, and which provides error condition information which is useful in a programmatical fashion.
  
  This patch would allow https://bugs.kde.org/show_bug.cgi?id=395937 to be fixed in a non-hackish fashion.

REPOSITORY
  R304 KNewStuff

REVISION DETAIL
  https://phabricator.kde.org/D16665

AFFECTED FILES
  src/attica/atticaprovider.cpp
  src/core/CMakeLists.txt
  src/core/engine.cpp
  src/core/engine.h
  src/core/errorcode.h
  src/core/provider.h

To: leinir, #knewstuff, apol
Cc: kde-frameworks-devel, #knewstuff, michaelh, ZrenBot, ngraham, bruns
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