D21089: Don't recalculate scene points when any logical points are available

[Martin Marmsoler]

Murmele created this revision.
Murmele added a reviewer: asemke.
Murmele added a project: LabPlot.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
Murmele requested review of this revision.

REVISION SUMMARY
  - Don't recalculate scene Points, if no points are available
  - swap indices only, if both are valid, otherwise don't swap

REPOSITORY
  R262 LabPlot

REVISION DETAIL
  https://phabricator.kde.org/D21089

AFFECTED FILES
  src/backend/worksheet/plots/cartesian/XYCurve.cpp

To: Murmele, asemke
Cc: kde-edu, narvaez, apol
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