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.
This commit resolves an issue where the edit button was not visible
during message hover for new messages. The problem occurred when a
message was sent after the hover event, resulting in the hovered
message being a local copy with the `locally_echoed` attribute set
to true. This caused the `is_message_editable_ignoring_permissions`
function to return false, subsequently causing `is_content_editable`
to return false as well. As a result, the `is_content_editable`
argument was false, leading to the edit button not being displayed.
The issue was caused due `$current_message_hover` being set to the
locally echoed version of `$message_row`. When the message was
successfully sent and the message was rerendered, the `message_hover`
function was called again on the properly sent message row.
However, the conditional check `($current_message_hover &&
rows.id($current_message_hover) === id)` returned true because
`$current_message_hover`, set to the locally echoed version, had the
same ID as the actual `$message_row`. Consequently, this condition
returned true at the start of the `message_hover` function,
preventing further execution of message_hover function and,
consequently, the updating of hover buttons.
To address this, an `else if` condition was introduced to check if
the message is locally echoed. If true, the function is terminated
to prevent `$current_message_hover` from being set to the locally
echoed version of `$message_row` until the message is sent correctly.
Once the message is sent correctly, the `message_hover` function is
executed again, setting `$current_message_row` to the properly sent
version of `$message_row`, and resulting in updating of hover buttons.
Fixes#25312
