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b8efb9739e
Allows for validation of the combobox through the hidden entry widget. User is able to validate provided that they *do not delete or insert text*. If the user wishes to do this in validation, they first must ensure that the customtkinter library does not trigger the call repeatidly AND should add a short delay (via self.after). This is because on when `self._entry.insert` is called within customtkinter, it will clear the `validate` property thus causing future validation to fail. Signed off by Trask Crane (hcrane3@gatech.edu)