Add lifecycle event handlers to toga.Window

Add lifecycle event handlers to toga.Window: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). Add lifecycle event handlers to toga.Window Right now a Window only lets you respond to one lifecycle event, on close. Applications frequently need to react to a window changing its…

The task

Add lifecycle event handlers to toga.Window Right now a Window only lets you respond to one lifecycle event, on_close. Applications frequently need to react to a window changing its focus or visibility — for example, pausing background work when a window is hidden, or…

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.