https://bugs.kde.org/show_bug.cgi?id=426025
--- Comment #7 from Dave Gilbert <gilbertd+...@treblig.org> ---
I think I kind of understand what's going on, but not 100% and hmm.
void View::drawImplicit(Function *function, QPainter *painter)
{
....
QList<QPointF> singular;
...
for (const QPointF &point : qAsConst(singular)) {
...
for (double t : qAsConst(roots)) {
double x = point.x() + epsilon * lcos(t);
double y = point.y() + epsilon * lsin(t);
drawImplicitInSquare(plot, painter, x, y, {}, &singular);
}
so, 'singular' - which I think is a list being walked in the outer for, gets
modified by 'drawImplicitInSquare' in a corner case - which I think is the
fact tan is not-contiguous.
I think turning that loop into a QMutableListIterator might work.
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