is there a search dialog? I don't see one. if I'm unable to find a task, or want to quickly jump to it, there's no way to do that.>?
You can use the "q: " option to search for a keyword within a task. Simply type q: phonecall (for example) in the search box in the top-left corner and both active and completed tasks with this keyword will be displayed.
You can jump to them within their projects by clicking on the project name on the right side of the found tasks.