Set the position to be used for the message window mwn. x and y specify the position of the control point of the window, while x-align and y-align specify a fraction of the width and height of the message window to offset it from the specified position. x-align and y-align should each be in the range [-1,0]. E.g., If x-align and y-align are both -0.5, the window will be centered at viewport pixel position x, y. Any of the parameters excep mwn can be #f to mean not to change the existing value.
Module: Built-in Primitive
Defined in src/message-window.c at line 457 (CVS log)