Handle relative paths for the screenshot rc command correctly

kitty/rc/screenshot.py

@@ -110,7 +110,7 @@ class Screenshot(RemoteCommand):
                 if output_path:
                     with open(os.path.expanduser(output_path), 'wb') as f:
                         f.write(png_data)
-                    responder.send_data(True)
+                    responder.send_data(f'Screenshot saved to: {os.path.abspath(f.name)}')
                 else:
                     responder.send_data(standard_b64encode(png_data).decode('ascii'))
             except Exception as e:

tools/cmd/at/screenshot.go

@@ -5,6 +5,7 @@ package at
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 
 	"github.com/emmansun/base64"
 )
@@ -32,7 +33,11 @@ func read_screenshot_args(io_data *rc_io_data, args []string) (func(io_data *rc_
 		// io_data.rc.Payload is only populated after this generator is created,
 		// so the payload field must be set here rather than above.
 		if len(args) == 1 {
-			set_payload_string_field(io_data, "Output_path", args[0])
+			path, err := filepath.Abs(args[0])
+			if err != nil {
+				return false, fmt.Errorf("%s is not a valid path with error: %w", args[0], err)
+			}
+			set_payload_string_field(io_data, "Output_path", path)
 		}
 		return true, nil
 	}, nil