Adds a 'Search in topic' button to the topic toolbar that pre-fills the search box with the in:topic- prefix.
NodeBB has embedded search function to search posts within the topics, but it only support using keyboard hotkey to trigger. However, the keyboard hotkey may mask by some browsers. This plugin adds a 'Search in topic' button to the topic toolbar that pre-fills the search box with the in:topic- prefix.
The search box prefills will be retained when you are in the same topic.
