D11626: Fix problems with repetitive addition of function `cantor_print ()` in worksheet

[Nikita Sirgienko]

sirgienko created this revision.
sirgienko added a reviewer: Cantor.
sirgienko added a project: Cantor.
Restricted Application added a subscriber: KDE Edu.
Restricted Application added a project: KDE Edu.
sirgienko requested review of this revision.

REVISION SUMMARY
  Octave use special script for plots, that is added for each entry with octave plot commands. Unfortunately, this command is add to entry when expressions in worksheet are saving (maybe should add virtual method `toSaveString()` to `Cantor::Expression`?). So, I have added addition check, if this command already exist in entry, to avoid the multiple addition of this command to entries each time, when worksheet save and load.

TEST PLAN
  1. Create worksheet and write some commands to print plots
  2. Save and load this worksheet
  3. Do 2) again few times
  4. Verify,that `cantor_print()` function appears no more than once in each entry.

REPOSITORY
  R55 Cantor

REVISION DETAIL
  https://phabricator.kde.org/D11626

AFFECTED FILES
  src/backends/octave/octaveexpression.cpp

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