Make the `R' command get the correct relative <img>s

* lisp/net/eww.el (eww-readable): Preserve the base URL so
that image expansions are fetched from the right place (bug#22605).

(cherry picked from commit 8722e849f75ceafb82a1c17105e8ab76077a8ebc)

Backport:

1 files changed, 4 insertions, 2 deletions

diff --git a/lisp/net/eww.el b/lisp/net/eww.el
index 5e24d4fef4e..da920c14aec 100644
--- a/lisp/net/eww.el
+++ b/lisp/net/eww.el
@@ -615,11 +615,13 @@ the like."
                 (condition-case nil
                     (decode-coding-region (point-min) (point-max) 'utf-8)
                   (coding-system-error nil))
-                (libxml-parse-html-region (point-min) (point-max)))))
+                (libxml-parse-html-region (point-min) (point-max))))
+         (base (plist-get eww-data :url)))
     (eww-score-readability dom)
     (eww-save-history)
     (eww-display-html nil nil
-                      (eww-highest-readability dom)
+                      (list 'base (list (cons 'href base))
+                            (eww-highest-readability dom))
                       nil (current-buffer))
     (dolist (elem '(:source :url :title :next :previous :up))
       (plist-put eww-data elem (plist-get old-data elem)))