e.g., from a comment in the commit:
// Execute the conditional code if all conditions are true.
// Example usage:
// {{#if_and cond1 cond2 cond3}}
// <p>All true</p>
// {{/if_and}}
We'll use this for the email forwarding UI, but it may also be
generally useful, and easy to generalize to OR.
(imported from commit da601f94d9da300213ff46be50255135c014eca0)
When you read messages in a narrow and then un-narrow, collapse
adjacent messages read in the narrow into a summary row that can
be clicked to expand those messages.
Scoped to staging with feature flags.
The implementation of this within our current MessageList is rather ugly.
(imported from commit bcb3a39d8c0c334136fe86318f18ead03f0f50bf)
Jessica McKellar
Kevin Mehall
Tim Abbott