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Description of problem:
The 'r' command of the vi editing mode when used on the last character
of a line, after modifying the last character then swaps the last two
characters.

Version-Release number of selected component (if applicable):
bash-3.0-2

How reproducible:
Always

Steps to Reproduce:
1. Launch a bash shell
2. Set editing mode to 'vi' with 'set -o vi'
3. Type any command, but don't hit return
4. Enter vi-command mode by hitting the escape key
5. Go to the end of line with the '$' command
6. Type 'r' to change the last character
7. Type any character (other than what the character already is)
    

Actual Results:  The last two characters are inexplicably swapped
after the last character is changed.

Expected Results:  The last two characters should not be swapped.

Additional info:

This probably a readline 5.0 bug, but since readline 5.0 is not
included as a separate component (yet), then I believe this belongs
here as a bash bug.