Gets the icon name of this, as it should be displayed for an icon (minimized state).
Always returns some value, even if this has no icon name set; use has_icon_name if you need to know whether the returned icon name is "real" or not.
Contrast with get_name, which returns this's title, not its icon title.
| this |
a Window |
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the icon name of this, or a fallback icon name if no icon name is available. |