gnu: emacs-helpful: Update to 0.19

* gnu/packages/patches/emacs-helpful-docstring-test.patch: New file.
* gnu/packages/emacs-xyz.scm (emacs-helpful): Update to 0.19.
[source]: Use the patch.
* gnu/local.mk (dist_patch_DATA): Register the patch.

Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

gnu/local.mk

@@ -1028,6 +1028,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/emacs-git-email-missing-parens.patch	\
   %D%/packages/patches/emacs-fix-scheme-indent-function.patch	\
   %D%/packages/patches/emacs-json-reformat-fix-tests.patch	\
+  %D%/packages/patches/emacs-helpful-fix-docstring-test.patch	\
   %D%/packages/patches/emacs-highlight-stages-add-gexp.patch	\
   %D%/packages/patches/emacs-hyperbole-toggle-messaging.patch	\
   %D%/packages/patches/emacs-libgit-use-system-libgit2.patch    \

gnu/packages/emacs-xyz.scm

@@ -20130,7 +20130,7 @@ (define-public emacs-download-region
 (define-public emacs-helpful
   (package
     (name "emacs-helpful")
-    (version "0.18")
+    (version "0.19")
     (source
      (origin
        (method git-fetch)
@@ -20139,7 +20139,9 @@ (define-public emacs-helpful
              (commit version)))
        (file-name (git-file-name name version))
        (sha256
-        (base32 "0gdjxykqkal2x765mi51m99i5ql23i1fy909wy4mzj5ajhjfgqcc"))))
+        (base32 "0qwsifzsjw95l83m7z07fr9h1sqbhggwmcps1qgbddpan2a8ab8a"))
+       ;; Cherry-picked from upstream, remove when bumping to 0.20.
+       (patches (search-patches "emacs-helpful-fix-docstring-test.patch"))))
     (build-system emacs-build-system)
     (propagated-inputs
      (list emacs-elisp-refs emacs-dash emacs-s emacs-f emacs-shut-up))

gnu/packages/patches/emacs-helpful-fix-docstring-test.patch

@@ -0,0 +1,18 @@
+This patch fixing a build failure has been cherry-picked from upstream.
+Originally submitted as pull request by Erik Šabič.
+See also <https://github.com/Wilfred/helpful/pull/296>.
+diff --git a/test/helpful-unit-test.el b/test/helpful-unit-test.el
+index a07aa8e..8a95129 100644
+--- a/test/helpful-unit-test.el
++++ b/test/helpful-unit-test.el
+@@ -119,7 +119,9 @@ bar")))
+   (should
+    (equal
+     (helpful--docstring #'test-foo-advised t)
+-    "Docstring here too.")))
++    (if (version< emacs-version "28")
++        "Docstring here too."
++    "Docstring here too.\n\nThis function has :around advice: `ad-Advice-test-foo-advised'."))))
+ 
+ (defun test-foo-no-docstring ()
+   nil)