🚀 go-pugleaf

SlickEdit is available on Linux (and Windows, and OS/2, and various *nix).
Better than CodeWright, IMO.

> 1) the current line whre the cursor is located can either be highlited
> or "outlined"
    Check.

> 2) window splitting in all directions: top, bottom, left, and right.
    I think so.  If it's not built in, it would be simple to create a macro
out of the built-in primitives.

> 3) line chages as well as added line will have a different color
> indicator in the first column (it's called chromatic change)
    Check.

> 4) searching a keyword (variable, function, etc) in multiple files will
> bring out a separate output pane; when the keyword appears in various
> files, by browsing through the search result and double clicking on the
> found keyword on a particular file will open that file automatically.
    Yep.  You can either clear previous search results, or append your new
search to the existing search results list.