Partly fix (unreported) particles not updating correctly when changing settings.
Point-cached particles (those using simulations) would not update at all outside of first frame, due to PSYS_RECALC_RESET flag being ingnored in `system_step()`... For some mysterious reasons, udate is still non-fully functional outside of startframe (e.g. changing face distribution between random and jittered), but at least when choosing 'Vertices' you get particles from verts and not faces!
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@ -3880,8 +3880,8 @@ static void system_step(ParticleSimulationData *sim, float cfra)
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BKE_ptcache_id_time(pid, sim->scene, 0.0f, &startframe, &endframe, NULL);
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/* clear everythin on start frame */
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if (cfra == startframe) {
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/* clear everything on start frame, or when psys needs full reset! */
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if ((cfra == startframe) || (psys->recalc & PSYS_RECALC_RESET)) {
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BKE_ptcache_id_reset(sim->scene, pid, PTCACHE_RESET_OUTDATED);
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BKE_ptcache_validate(cache, startframe);
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cache->flag &= ~PTCACHE_REDO_NEEDED;
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