Support in-place line editing in the command screen

[davidrg]

Its rather annoying that errors in a command can't be corrected like the can in a regular shell - you're forced to delete characters until you get to the error, then retype the rest of the command. Or not even errors - perhaps you want to select a long command from the command history and change one detail about it - can't do that either.

This is not a new limitation, and its not a limitation unique to Kermit 95 - C-Kermit can't do this either.

There is some discussion about this in the C-Kermit To-Do List (see the section titled "Interactive command parser").

If this is attempted at some point, it should probably be #ifdef'd to OS2 to start with as its going to rely on a bunch of K95-specific APIs for moving the cursor around - proper terminal emulation isn't currently fully supported on the command screen.
IKSD may add some complication too - the K95-specific APIs for moving the cursor around won't work over telnet so if K95 is running as IKSD (or over stdin/stdout for that matter) it should instead probably attempt ANSI escapes.