Fix inconsistent tiebreak scores when --nth is used

Make sure to consistently calculate tiebreak scores based on the
original line.

This change may not be preferable if you filter aligned tabular input on
a subset of columns using --nth. However, if we calculate length
tiebreak only on the matched components instead of the entire line, the
result can be very confusing when multiple --nth components are
specified, so let's keep it simple and consistent.

Close #926

test/test_go.rb

@@ -683,62 +683,10 @@ class TestGoFZF < TestBase
     ]
     assert_equal output, `#{FZF} -fh < #{tempname}`.split($/)
 
-    output = %w[
-      1234567:h
-      12345:he
-      1:hell
-      123:hello
-    ]
+    # Since 0.16.8, --nth doesn't affect --tiebreak
     assert_equal output, `#{FZF} -fh -n2 -d: < #{tempname}`.split($/)
   end
 
-  def test_tiebreak_length_with_nth_trim_length
-    input = [
-      "apple juice   bottle 1",
-      "apple  ui     bottle 2",
-      "app     ice   bottle 3",
-      "app     ic    bottle 4",
-    ]
-    writelines tempname, input
-
-    # len(1)
-    output = [
-      "app     ice   bottle 3",
-      "app     ic    bottle 4",
-      "apple juice   bottle 1",
-      "apple  ui     bottle 2",
-    ]
-    assert_equal output, `#{FZF} -fa -n1 < #{tempname}`.split($/)
-
-    # len(1 ~ 2)
-    output = [
-      "app     ic    bottle 4",
-      "app     ice   bottle 3",
-      "apple  ui     bottle 2",
-      "apple juice   bottle 1",
-    ]
-    assert_equal output, `#{FZF} -fai -n1..2 < #{tempname}`.split($/)
-
-    # len(1) + len(2)
-    output = [
-      "app     ic    bottle 4",
-      "app     ice   bottle 3",
-      "apple  ui     bottle 2",
-      "apple juice   bottle 1",
-    ]
-    assert_equal output, `#{FZF} -x -f"a i" -n1,2 < #{tempname}`.split($/)
-
-    # len(2)
-    output = [
-      "app     ic    bottle 4",
-      "app     ice   bottle 3",
-      "apple  ui     bottle 2",
-      "apple juice   bottle 1",
-    ]
-    assert_equal output, `#{FZF} -fi -n2 < #{tempname}`.split($/)
-    assert_equal output, `#{FZF} -fi -n2,1..2 < #{tempname}`.split($/)
-  end
-
   def test_invalid_cache
     tmux.send_keys "(echo d; echo D; echo x) | #{fzf '-q d'}", :Enter
     tmux.until { |lines| lines[-2].include? '2/3' }