- Prevent a crash when toasts arrive very fast.
- Ensure the fast cancellation of the processing data flow without removing toasts when requested by separating "Clear()" from "Cancel()".
- Full rework of asynchronous primitives regarding the early cancellation of tasks with the hopes of increasing responsiveness.
- Allow actions to be cancelled when the icon is right-clicked.
- Make the tray icon rotate freely when activity occurs instead of just implementing a resetting spinner.
- The icon now spins when background indexing indexes a new message.
- Allow toasts to expand horizontally when the vertical stack is full in order to be more appropriate for screens that are "wider than taller" and where a single toast column might be small relatively.