set-label in window<%>

Sets a window's label. The window's natural minimum size might be different after the label is changed, but the window's minimum size is not recomputed.

See get-label for more information.

• (send a-window set-label l) -> void
     l : string (up to 200 characters)

  If the window was not created with a label, or if the window was created with a non-string label, l is ignored.