[Rd] Enter key in data editor bombs program in MDI (PR#11579)

[mikehallquist at hotmail.com]

Full_Name: Michael H
Version: 2.7
OS: Windows XP SP3
Submission from: (NULL) (74.74.76.1)


When running R with the multiple document interface, pressing enter in the data
editor causes the program to crash with the following command:

Dataset <- edit(as.data.frame(NULL))

This problem persists when using the fix command, such as fix(Dataset).

Interestingly, the arrow keys and mouse work fine in navigating through the
dataset.

Also, this problem only occurs for me in MDI mode, not in SDI mode.