This pr tries to fix gnu test case color-clear-to-eol.
This test tries to check when a colored file name that is too long is wrapped, it will append a clear-to-end-of-line ANSI code. GNU's ls does this because in some terminals, when ls tries to print at the last line of the terminal window and needs to scroll the text up in order to print the new lines, the background color would stretch up to the end of the line.
for example

seq 200 # inorder to fill the terminal window
touch zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.foo # create a long named file so that it would wrap
env TERM=xterm  LS_COLORS="*.foo=0;31;42" TIME_STYLE=+T ls  --color=always zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.foo

without the patch, it would look like this

with the patch

Behaviors changed

• ls would append a clear-to-eol at the end of the colored name if it would wrap
• $COLUMNS has more priority than the calculated terminal width