https://bugs.kde.org/show_bug.cgi?id=430884

            Bug ID: 430884
           Summary: crash during construction of circle by three points
           Product: kig
           Version: unspecified
          Platform: Compiled Sources
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: david.narv...@computer.org
          Reporter: paol...@dmf.unicatt.it
  Target Milestone: ---

SUMMARY

Under particular circumstances during creation of a circle by three points kig
crashes with segmentation fault and the message:

QPainterPath::arcTo: Adding arc where a parameter is NaN, results are undefined


STEPS TO REPRODUCE
1. start kig and create a point at the origin (holding down the 'shift' key
allows to position points exactly at grid intersections)
2. click on 'circle by three points button'
3. select the constructed point as first of the three points
4. hold down the shift key and hover pointer on the origin (on the constructed
point)


OBSERVED RESULT

kig crashes with Segmentation fault and the message:

QPainterPath::arcTo: Adding arc where a parameter is NaN, results are undefined

on the console where kig was started

EXPECTED RESULT

No crash, of course!


SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 
(available in About System)

KDE Plasma Version: kf5-plasma-5.75.0-1.fc33.x86_64
KDE Frameworks Version: kf5 5.75.0 (I think)
Qt Version: qt5 5.15.2

ADDITIONAL INFORMATION

Although seemingly difficult to trigger this bug, it can actually happen during
a normal kig construction

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