This fixes:
- a regression from 30c152c, where navigating to a topic's last reply
via keyboard would lose track of the topic when returning to the topic
list
- an issue where if a topic's last post is a small post, navigating to it
via keyboard would not focus the post
Co-authored-by: David Taylor <david@taylorhq.com>
Using the lastViewedTopicId indiscriminately can cause strange scrolling behavior when navigating to a **different** topic list after viewing a topic. We only want to refocus the topic when going 'back' to the same topic list which originally triggered the navigation.
Previously we were implementing scroll reset/memorization on a per-page basis. Many of these approaches relied on the `didInsertElement` hook, which is no longer appropriate since Discourse changed to use the 'loading slider' strategy for page transitions.
This commit rips out all of our custom scroll resetting/memorizing, and implements those things in a generic service. There are two features:
1. After every route transition, scroll to the top of the page
2. When using browser back/forward buttons, restore the last known scroll position for those routes
To opt-out of the behaviour, individual routes can add a scrollOnTransition boolean to their RouteInfo metadata using Ember's `buildRouteInfoMetadata` hook.
What is the problem?
We have a hidden site setting `show_category_definitions_in_topic_lists`
which is set to false by default. What this means is that category
definition topics are not shown in the topic list by default. Only the
category definition topic for the category being viewed will be shown.
However, we have a bug where we would show that a category has new
topics when a new child category along with its category definition
topic is created even though the topic list does not list the child
category's category definition topic.
What is the fix here?
This commit fixes the problem by shipping down an additional
`is_category_topic` attribute in `TopicTrackingStateItemSerializer` when
the `show_category_definitions_in_topic_lists` site setting has been set
to false. With the new attribute, we can then exclude counting child
categories' category definition topics when counting new and unread
counts for a category.
Penar Musaraj
David Taylor
Alan Guo Xiang Tan
Natalie Tay