[tor-bugs] #20218 [Core Tor/Tor]: Fix and refactor and redocument routerstatus_has_changed

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#20218: Fix and refactor and redocument routerstatus_has_changed
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 Reporter:  nickm                                |          Owner:  (none)
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  029-proposed, tor-control, easy,     |  Actual Points:
  spec-conformance                               |
Parent ID:                                       |         Points:  .1
 Reviewer:                                       |        Sponsor:
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Comment (by teor):

 Yes, this field is the right field.

 Here's how to do this patch:
 1. Create a new function that just checks this field
 2. Find all calls to router_has_changed() in control.c and from controller
 helper functions
 3. Replace them with a call to this new function

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20218#comment:15>
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