Fix incorrect area calculation in QgsLineString::sumUpArea #59156
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Description
This PR fixes the area calculation in the
QgsLineString::sumUpArea
method. The previous formula incorrectly computed the area for closed rings, always returning negative values regardless of the orientation of the vertices. The issue occurred because the formula used in the loop didn't properly account for the orientation of the line.Changes:
This resolves the issue returned by @agiudiceandrea where both clockwise and counterclockwise rings returned negative areas.
Fixes #58333