Factor Inline Input 2

The inline input/conversion has become stable because I understood the cause of the crash of Factor IDE.

Click this image to see a video of the conversion.

I have made progress towards completion, but the current implementation lacks a very large one.

Inline conversion uses the underline display to tell the user the target area of the conversion operation and the break of the conversion unit. For now, there is no such feedback.

The current factor does not have the function to display the underline. I must think about how to enable the function.