tl;dr: Kitty 0.50 adds dockable windows for status bars and file trees, session restoration across logouts (encrypted via keychain on macOS), and tabs usable as named workspaces. Notable additions include touchscreen support and native-looking decorations on Wayland, new cursor-trail shaders with key-triggered shader events, indexed color images in the graphics protocol, support for the Program Status Protocol (OSC 7501), and automatic color themes that preserve program-set colors. The release also fixes a remote control authentication bypass, numerous terminal emulation bugs, and various memory safety issues.