gui-utils:unsaved-warning

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`gui-utils:unsaved-warning`

This displays a dialog that warns the user of a unsaved file.

(gui-utils:unsaved-warning filename action can-save-now?) -> (union 'continue 'save 'cancel)
    filename : string
    action : string
    can-save-now? : boolean
The string, action, indicates what action is about to take place. For example, if the application is about to close a file, a good action is "Close". The result symbol indicates the user's choice.