Fix error when --query contains wide-length characters

src/terminal.go

@@ -86,7 +86,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		prompt:     opts.Prompt,
 		tac:        opts.Sort == 0,
 		reverse:    opts.Reverse,
-		cx:         displayWidth(input),
+		cx:         len(input),
 		cy:         0,
 		offset:     0,
 		yanked:     []rune{},

test/test_go.rb

@@ -273,5 +273,13 @@ class TestGoFZF < MiniTest::Unit::TestCase
     tmux.until { |lines| lines[-1].include?('FIN') }
     assert_equal ['555555'], readonce.split($/)
   end
+
+  def test_query_unicode
+    tmux.send_keys "(echo abc; echo 가나다) | fzf --query 가다 > #{TEMPNAME}", :Enter
+    tmux.until { |lines| lines.last.start_with? '>' }
+    tmux.send_keys :Enter
+    tmux.until { |lines| lines[-1].include?('FIN') }
+    assert_equal ['가나다'], readonce.split($/)
+  end
 end