When transitioning from a tag topic list e.g. /tag/alerts
to the / route the topic list was not reloaded because the
same preload key was used for both lists (topic_list_latest).
The topic list was only reloaded when clicking on the / route
a second time because then it is forced to reload.
In the topic list adapter, we call `PreloadStore.getAndRemove` to
get the topic lists:
https://github.com/discourse/discourse/blob/534777f5fdbf48a6a77a362636cc936a19c17c43/app/assets/javascripts/discourse/app/adapters/topic-list.js#L34-L41
Now instead of both / and /tag/alerts sharing the same preload
key of `topic_list_latest`, the tag has a key of `topic_list_tag/alerts/l/latest`
Martin Brennan
cf1a80dea6