This function is typically used when implementing a
subclass. Obtains the preferred size of a widget. The container
uses this information to arrange its child widgets and decide what
size allocations to give them with
You can also call this function from an application, with some caveats. Most notably, getting a size request requires the widget to be associated with a screen, because font information may be needed. Multihead-aware applications should keep this in mind.
Also remember that the size request is not necessarily the size a widget will actually be allocated.
A list containing the following elements:
Derived by RGtkGen from GTK+ documentation
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