Your comments

Thanks for your work on CN.
I have reposted.
About the syntax highlight, here I just want some easy ways to use color for more readable, not for program. And maybe CN can have a option to choose other editors for editing and viewing the code.
Thanks. Actually the image is using EmEditor. So I want the CN can take some features from it. For English is not my first language, the post maybe some strange.

1 is correct, showing the end and blank line. For 2, when scrolling to the last line usually at the bottom of window, I want to scroll one more page to let the last to top for viewing and editing. For 3, just some easy ways to use highlight, like I can use // for color,  not useing right click or Ctrl+H.