DialogPresentationMode  
    Describes the available presentation modes for class@Dialog.
New values may be added to this enumeration over time.
See property@Dialog:presentation-mode.
Since
1.5
Functions
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                  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
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                  Returns an array containing the constants of this enum type, in the order they're declared.