ordering elements in save sequence not respected leading to bugs

[rdemaria]

When saving an LHC sequence with a maker at the IP, I get

lhcb1: sequence, l = 26658.8832;
atlaspipe1.r1, at = 0, from = ip1;
ip1: omk, at = 0,apertype=circle,aperture:={0.029},aper_tol:={0.011};
atlaspipe2.r1, at = 0.36967, from = ip1;
...

which generate negative drifts.

[ldeniau]

After discussion with Riccardo, the important point is that the negative drift occurs after a CYCLE on IP1, i.e. the marker atlaspipe1.r1 “from" refers to IP1, which is at L from it after the cycle and the reported negative drift is of -L...

On 9 Oct 2018, at 11:41, Riccardo De Maria notifications@github.com<mailto:notifications@github.com> wrote:

When saving an LHC sequence with a maker at the IP, I get

lhcb1: sequence, l = 26658.8832; atlaspipe1.r1, at = 0, from = ip1; ip1: omk, at = 0,apertype=circle,aperture:={0.029},aper_tol:={0.011}; atlaspipe2.r1, at = 0.36967, from = ip1; ...

which generate negative drifts.

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[tpersson]

This is fixed in PR #686