D11188: Fix use after free in RadialMap::Widget::invalidate()

[Szymon Janus]

janus created this revision.
Restricted Application added a subscriber: kde-utils-devel.
janus requested review of this revision.

REVISION SUMMARY
  Emit aboutToEmptyCache to invoke RadialMap::Widget::invalidate(),
  so folder can be safely deleted.
  
  If "Scan across system boundaries" isn't set and there is mountpoint B
  contained in another mountpoint A, user may trigger segfault if scan of
  A and then B is requested. It is caused by call of MainWindow class to
  m_map->invalidate() method, which is invoked after m_map's m_tree member
  is deleted during ScanManager::start method.
  
  This fix causes that RadialMap::Widget::invalidate() is called twice in
  fact, however second call is fine, because "invalidate" is guarded by
  "isValid" method.
  
  BUG: 389119

REPOSITORY
  R352 Filelight

REVISION DETAIL
  https://phabricator.kde.org/D11188

AFFECTED FILES
  src/scan.cpp

To: janus
Cc: kde-utils-devel
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