— Window Hook: before-add-window-hook
— Window Hook: add-window-hook

Called when the window is first adopted by the window manager. This occurs before the window is created, installed or placed. At this early stage, the only safe action is to set properties of the window (with window-set).

add-window-hook is a deprecated hook, replaced by before-add-window-hook. It is called immediately after before-add-window-hook.

— Window Hook: after-add-window-hook

Called when the window is first adopted by the window manager. This occurs after the window has been created, installed and placed.

— Window Hook: after-framing-hook

Called after a window gets a frame assigned, or after a window's frame is rebuilt.