D20606: Add action to toggle folding of child ranges

[loh tar]

loh.tar marked an inline comment as done.

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D20606

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