OK, I just don't quite understand, even while I have working code!
I have an app where, as the model changes (in particular the value
representing the 'page' of my single page app), the Url is updated with
this task
```
Navigation.newUrl (toUrl model)
```
But as the Url changes, I get a new message from Navigation because of:
```
main =
Navigation.programWithFlags
(Routing.urlParser RouteTo)
{ init = initWithFlags
, update = Routing.update
, view = view
, subscriptions = subscriptions
}
```
When first loading the app, this message is useful and I can use it to
direct to the appropriate opening page. But thereafter this message is
redundant - I already made all the model changes I wanted before and that
caused the Url update. Without some care I even get a loop of each Routing
message causing the
*I suspect I am missing something rather important, but am not sure what?*
One option would be to use anchor tags to cause the switch pages, and only
do model changes when I get a `RouteTo` message, but even then I have some
url changes resulting from the clicking on an element within a page, and I
don't think that is a place for anchors. (As I use html urls, rather than
`#` ones I also have to be careful not to let the page get reloaded)
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