Niri's IPC code has now implemented an event stream for listening to compositor events, various other new IPC features were added, window height handling changes, libdisplay-info is now used to provide better monitor names via parsing the EDID information, transactional updates for window resizing and window closing, on-demand variable refresh rate, and small UX enhancements.
Downloads and more information on the Niri 0.1.9 compositor release via GitHub .