ConstReadonlyAnyWindow: 4Test whether any ImGui window is focused.
ReadonlyChildWindows: 1Include focused child windows.
ReadonlyNone: 0Test only the current window.
ReadonlyNoPopupHierarchy: 8Do not treat a popup's emitter as its parent.
ReadonlyRootAndChildWindows: 3Test the root window and all its children.
ReadonlyRootWindow: 2Start the test from the topmost parent.
Scope of IsWindowFocused(); use IO capture flags to route raw input.