Reset WbFieldRef->last_update After Simulation Reset
#6758
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Description
Currently, after the simulation is reset by a controller, supervisors can occasionally read stale values from fields (see the linked issue for details). This PR updates Webots to broadcast a
C_SUPERVISOR_SIMULATION_RESETmessage whenever the simulation is reset. It then updates controllers to respond to this message by resetting thelast_updatefield of all of their field references. This effectively marks their cached data as invalid, so when the controller tries to read the value, it will re-fetch it from Webots.Related Issues
This pull-request fixes issue #6670.
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