Vi mode breaks compatibility with readline: special handling for 'cw'

[jdanbrown]

Both vim and libreadline handle 'cw' specially: instead of deleting the sequence of text moved through by the 'w' movement command—the rest of the word and any trailing whitespace—it only deletes the rest of the word. So 'cw'/'ce' and 'cW'/'cE' are synonymous even though 'dw'/'de' and 'dW'/'dE' aren't.

[judah]

Now fixed in HEAD.