get-window-text-extent

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`get-window-text-extent`

Returns the pixel size of a string drawn as a window's label or value.

(get-window-text-extent string font) -> two exact non-negative integers: width and height
string : string
font : font% object
Returns the extent of the given string drawn with the given font. For information about the font used to draw a window's label or value, see set-label-font and set-control-font.