Both /filter and /loadbuf don't know the default colour of a filtered line (the one you specify in an echo/aline command, with no ctrl code), both pass it with the default text colour (or the one you specify, for /loadbuf). I'd like them to match the proper colours by default, or maybe through a new switch.

Examples (assuming colour 3 is green and colour 4 is red):
//window @x | echo 3 @x green | aline 4 @x red | filter -wwc @x @x
- @x won't contain a green line anymore, nor a red one.
//window @x | echo 3 @x green | aline 4 @x red | savebuf @x tmp | loadbuf -r @x tmp | .remove tmp
- Same result.

P.S.: I couldn't find any feature suggestion on this subject, expanding the date range to the maximum etc.