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Not sure if you got the semantics right. The iconified window is drawn by the window manager. GTK can only provide some hints on how to do that.
The window manager does not have a concept of a program icon name. In the little rectangle that represents the iconified window the window manager writes the window title (!), and if GTK has supplied some icon on the application's behalf, the window manager might include it in that rectangle (some window managers don't, or allow the user to switch this off). Please note the text written is the window title *by definition*, not some label that could be changed.
Now while it is conceivable that a window manager might accept a hint in the form of a small text that replaces the window title when the window is iconified (I gather this is what you want), I'm not aware of any window manager that actually does that (anybody knowing better please correct me).
So if I understand your desire correctly, I have to disappoint you. In general, it's not possible.
Cheers Peter
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