Finish porting unicode input

tools/cmd/unicode_input/main.go

@@ -560,6 +560,7 @@ func run_loop(opts *Options) (lp *loop.Loop, err error) {
 
 	lp.OnInitialize = func() (string, error) {
 		h.initialize()
+		lp.SendOverlayReady()
 		return "", nil
 	}
 

tools/tui/loop/api.go

@@ -352,6 +352,10 @@ func (self *Loop) ClearScreen() {
 	self.QueueWriteString("\x1b[H\x1b[2J")
 }
 
+func (self *Loop) SendOverlayReady() {
+	self.QueueWriteString("\x1bP@kitty-overlay-ready|\x1b\\")
+}
+
 func (self *Loop) Quit(exit_code int) {
 	self.exit_code = exit_code
 	self.keep_going = false

tools/tui/ui_kitten.go

@@ -8,6 +8,8 @@ import (
 	"os"
 
 	"kitty/tools/utils"
+
+	"github.com/jamesruan/go-rfc1924/base85"
 )
 
 var _ = fmt.Print
@@ -21,7 +23,7 @@ func KittenOutputSerializer() func(any) (string, error) {
 			if err != nil {
 				return "", err
 			}
-			return "\x1bP@kitty-kitten-result|" + utils.UnsafeBytesToString(data) + "\x1b\\", nil
+			return "\x1bP@kitty-kitten-result|" + base85.EncodeToString(data) + "\x1b\\", nil
 		}
 	}
 	return func(what any) (string, error) {