Ignore xterm OSC control sequences

- OSC Ps ; Pt BEL
- OSC Ps ; Pt ST

Fix #1415

src/ansi.go

@@ -90,10 +90,11 @@ func init() {
 		- http://ascii-table.com/ansi-escape-sequences.php
 		- http://ascii-table.com/ansi-escape-sequences-vt-100.php
 		- http://tldp.org/HOWTO/Bash-Prompt-HOWTO/x405.html
+		- https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
 	*/
 	// The following regular expression will include not all but most of the
 	// frequently used ANSI sequences
-	ansiRegex = regexp.MustCompile("(?:\x1b[\\[()][0-9;]*[a-zA-Z@]|\x1b.|[\x0e\x0f]|.\x08)")
+	ansiRegex = regexp.MustCompile("(?:\x1b[\\[()][0-9;]*[a-zA-Z@]|\x1b][0-9];[[:print:]]+(?:\x1b\\\\|\x07)|\x1b.|[\x0e\x0f]|.\x08)")
 }
 
 func findAnsiStart(str string) int {

test/test_go.rb

@@ -1716,6 +1716,18 @@ class TestGoFZF < TestBase
     tmux.prepare
   end
 
+  def test_strip_xterm_osc_sequence
+    %W[\x07 \x1b\\].each do |esc|
+      writelines tempname, [%(printf $1"\e]4;3;rgb:aa/bb/cc#{esc} "$2)]
+      File.chmod(0o755, tempname)
+      tmux.prepare
+      tmux.send_keys(
+        %(echo foo bar | #{FZF} --preview '#{tempname} {2} {1}'), :Enter
+      )
+      tmux.until { |lines| lines.any_include?('bar foo') }
+      tmux.send_keys :Enter
+    end
+  end
 end
 
 module TestShell