Ticket #26642: 26642.patch

src/wp-includes/media.php

@@ -655 +655 @@
         if ( ! empty( $atts['id'] ) )
                 $atts['id'] = 'id="' . esc_attr( $atts['id'] ) . '" ';
 
-        $caption_width = 10 + $atts['width'];
+        $caption_width = $atts['width'];
 
         /**
          * Filter the width of an image's caption.
          *
-         * By default, the caption is 10 pixels greater than the width of the image,
-         * to prevent post content from running up against a floated image.
-         *
          * @since 3.7.0
          *
          * @param int $caption_width Width in pixels. To remove this inline style, return zero.