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Ensure that the child window has a specified aspect ratio or, if obey_child, has the same aspect ratio as its requested size. Derived from see section 5.23 The frame widget).
GtkAspectFrame type identifier.
GtkAspectFrame object and initialize it with the values
label, xalign, yalign, ratio and obey_child.
The new widget is returned as a pointer to a GtkWidget object.
NULL is returned on failure.
@gtkstdmacros{AspectFrame, ASPECT_FRAME}
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