D19254: [RFC] KateRenderer: Show tabs and space characters the smart way

[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.

REVISION SUMMARY
  The original bug says: Show tabs and space characters only on selection
  but I thought this way is it more handy
  
  - Show them always in current line
  - Show them as requested in selected lines
  - Enhanced to show also non printable spaces
  
  Questions:
  
  - Could it be the default, without the need for an option?
  - Ideas for naming?
  
  Bug:333446

TEST PLAN
  F6631558: pic.png <https://phabricator.kde.org/F6631558>

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D19254

AFFECTED FILES
  src/render/katerenderer.cpp

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