Plan: Fix old polyline vertices persisting after KML import #12891
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Description
Fixes #12852. Stumbled upon this way of solving it by trying to apply the
beginReset()andendReset()functions also used inQGCMapPolylineVisuals.qml, where they worked correctly to prevent old vertices from persisting (confirmed by trying to comment them out).qgroundcontrol/src/FlightMap/MapItems/QGCMapPolylineVisuals.qml
Lines 64 to 72 in 8016574
Test Steps
The repro case in #12852 won't work anymore, related UI manipulation is not broken by the fix.
Checklist:
Related Issue
Will fix #12852.
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