D11588: Fix broken octave backend and debug messages small change

[Alexander Semke]

asemke added a comment.


  In D11588#233714 <https://phabricator.kde.org/D11588#233714>, @sirgienko wrote:
  
  > > As to the fix of the actual problem you mentioned here, did you check the two lines I wrote in my previous comment? Can you please validate it also solves the problem on your side?
  >
  > No, it don't fix the problem. The problem is that we call `syntaxHighlighter` in the `Worksheet` constructor, which calls the `OctaveHighliter` constructor, which calls the `OctaveSession::evaluateExpression`, inside which a attempt is made to access the m_process method, which is initialized with nullptr (from `OctaveSession` constructor).
  >  So, for Octave, we *need* call `login` before `OctaveHighliter::constructor`, or we have seg. fault.
  
  
  Yes. And this is exactly what my code snippet does - it calls loginToSession() before the constructor of OctaveHighlither is called. My snippet has to be added before the line with  m_highlighter=session()->syntaxHighlighter(this); - I didn't mentioned this, I assumed it was clear.

REPOSITORY
  R55 Cantor

REVISION DETAIL
  https://phabricator.kde.org/D11588

To: sirgienko, #cantor
Cc: asemke, #cantor, #kde_edu, narvaez, apol
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