D21078: Avoid infinite loop in "Toggle Contained Nodes" action

[loh tar]

loh.tar created this revision.
loh.tar added a reviewer: KTextEditor.
Herald added projects: Kate, Frameworks.
Herald added subscribers: kde-frameworks-devel, kwrite-devel.
loh.tar requested review of this revision.

TEST PLAN
  Try and empty folding range like 
  ktexteditor/src/utils/kateconfig.cpp:634
  
  Where...
  
  KateRendererConfig::~KateRendererConfig()
  {
  }
  
  ...cause the hassle
  
  Each part of this patch solve the issue of its own, but I'm unsure which way to go. 
  I think it shouldn't be a folding range offered in such a case, will look at it later.

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D21078

AFFECTED FILES
  src/document/katebuffer.cpp
  src/view/kateview.cpp

To: loh.tar, #ktexteditor
Cc: kwrite-devel, kde-frameworks-devel, #ktexteditor, domson, michaelh, ngraham, bruns, demsking, cullmann, sars, dhaumann
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