edit-menu:preferences

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`edit-menu:preferences`

This method is called when the preferences menu-item of the edit-menu menu is selected. If edit-menu:preferences is bound to #f instead of a procedure, the preferences menu item will not be created.

(send a-frame:standard-menus edit-menu:preferences item evt) -> void
item : (instance (derived-from menu-item%))
evt : (instance control-event%)
Defaultly bound to:
```
  (lambda (item control) (preferences:show-dialog) #t) 
```

PLT