Review Request 122410: Fix actual warnings

[Lucas Hermann Negri]

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https://git.reviewboard.kde.org/r/122410/
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Review request for KDE Edu, Alexander Rieder, Filipe Saraiva, and Minh Ngo.


Repository: cantor


Description
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Fix actual warnings in the code base (not related to deprecations).


Diffs
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  src/backends/maxima/maximaexpression.cpp 14a5b59 
  src/backends/qalculate/qalculateexpression.cpp 1891baa 
  src/backends/qalculate/qalculateextensions.cpp e2f61e2 
  src/backends/sage/sagehighlighter.cpp 642a3d9 
  src/cantor_part.h 24bbfb0 
  src/cantor_part.cpp 88ca911 

Diff: https://git.reviewboard.kde.org/r/122410/diff/


Testing
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Warnings disapeared and the application is working as expected, as only one important change was performed (a reference to a local object was being returned. I've marked it as static to fix it).


Thanks,

Lucas Hermann Negri

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