Game hangs deleting duplicate flight plan

[lpgagnon]

Initial state: in transfer orbit with flight plan to perform circularization burn to geostationary

steps: 3 mouse clicks: Duplicate the flight plan, Delete the maneuver, Delete the flight plan.
result: game hangs. no crash, just complete UI freeze, game must be terminated manually. (audio keeps going though)

deleting without duplicating is fine.

interesting bits of error.log, matching time of freeze:

E1022 20:40:42.578752 42250880 interface_body.hpp:484] Reached maximum step count 4096 at time 1955-07-15T22:54:47,0044832229614258 (TT); requested t_final is 1955-07-29T09:31:47,4859068393707275 (TT).
E1022 20:40:42.958879 3438059520 matrix_computations_body.hpp:479] Difficult diagonalization: rows: 4 columns: 4
[snip]

bug is 100% reproducible; journal (and logs) attached (10MB zipped, 38MB unzipped).
principia_hang.zip

extra oddity; after creating journal, killing the game and restarting it, journaling was enabled from the start. not sure if that's deliberate; could have done bad things to my drive if I hadn't noticed.

[pleroy]

Thank you, Mario! But our bug fix is in another branch! 🍄🍄

(Turns out that we found the bug, but we fixed in it the branch that has flight plan optimization, and that branch is not merged yet.)

[pleroy]

I forgot to reply regarding "journaling was enabled from the start". This is by design, it has proven helpful to debug problems that happen very early when starting the mod/loading the save. If you forgot to disable journaling, slap yourself in the face.