This commit adds support for empty string as a valid topic name
in syntax for linking to channel messages.
The server stores it after empty string is replaced with
`realm_empty_topic_display_name` and wrapped with an <em> tag.
The web client parses the rendered_content and updates
the topic_name part in the HTML with topic_name in user's language
+ wraps it in a <span> tag with 'empty-topic-display' css class.
This commit adds support for empty string as a valid topic name
in syntax for linking to topics.
The server stores it after empty string is replaced with
`realm_empty_topic_display_name` and wrapped with an <em> tag.
The web client parses the rendered_content and updates
the topic_name part in the HTML with topic_name in user's language
+ wraps it in a <span> tag with 'empty-topic-display' css class.
Previously, we do not allow mentioning system user groups
at all. Now we want to use silent mention syntax for system
groups in the message sent when updating the posting permission
for a stream, so it is important to allowing silent mentioning
system groups at least. And there is no problem in allowing
silent mentions of system groups for all users.
We do not allow mentioning system groups as can_mention_group
for them is set to "Nobody" group.
Previously animated images were automatically played in the
message feed of the web app.
Now that we have still thumbnails available for them, we can add a new
personal setting, "web_animate_image_previews", which controls how the
animated images would be played in the web app message feed -- always
played, on hover, or only in the image viewer.
Fixes#31016.
