D17952: Fix Bug connection between start and end point

[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
  With this function call, sometimes "symbolPointsLogical" was filled with the previous data again (probably the retransform function was called a second time in this QApplication::processEvents() function), so the data was 2 times in this vector.
  Causes that the end and the start point of the curve are connected together.

REPOSITORY
  R262 LabPlot

REVISION DETAIL
  https://phabricator.kde.org/D17952

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

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