F1 and F3 allow partial retrieval of previous entry from console history. They are used as shortcuts such that if the following were entered at the command line:
``` md tmptmp cd <F3> ```
F3 will retrieve the previous line from history past the cursor position, and be auto-completed to "cd tmptmp". F1 works in a similar fashion, but with one character at a time.
-- v3: conhost: Implement F1 and F3 support for history retrieval.