[bug#41712] Update emacs-treemacs to v2.8

[Katherine Cox-Buday <cox.katherine.e@gmail.com>]

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17:34 kate says: guix refresh --list-dependent emacs-treemacs
A single dependent package: emacs-lsp-java@2.2

emacs-lsp-java still builds.

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From 110a634d3b819d3a738cf308e4e7912bece1b963 Mon Sep 17 00:00:00 2001
From: Katherine Cox-Buday <cox.katherine.e@gmail.com>
Date: Thu, 4 Jun 2020 10:45:44 -0500
Subject: [PATCH] gnu: emacs-treemacs: Update to 2.8.

* gnu/packages/emacs-xyz.scm (emacs-treemacs): Update to 2.8.
---
 gnu/packages/emacs-xyz.scm | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/gnu/packages/emacs-xyz.scm b/gnu/packages/emacs-xyz.scm
index 0f547425a0..c143370a63 100644
--- a/gnu/packages/emacs-xyz.scm
+++ b/gnu/packages/emacs-xyz.scm
@@ -19044,7 +19044,7 @@ processes for Emacs")
 (define-public emacs-treemacs
   (package
     (name "emacs-treemacs")
-    (version "2.6")
+    (version "2.8")
     (source (origin
               (method git-fetch)
               (uri (git-reference
@@ -19053,7 +19053,7 @@ processes for Emacs")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "13gs8g05xj7np3i2q3bbxg6zgdiazzn1spxii4x0cyd4pg83c0i1"))))
+                "0m083g3pg0n4ymi1w0jx34awr7cqbm4r561adij9kklblxsz7sc2"))))
     (build-system emacs-build-system)
     (propagated-inputs
       `(("emacs-dash" ,emacs-dash)
@@ -19075,7 +19075,9 @@ processes for Emacs")
          (add-after 'unpack 'fix-makefile
            (lambda _
              (substitute* "Makefile"
-               (("@\\$\\(CASK\\) exec ") ""))
+               (("@\\$\\(CASK\\) exec ") "")
+               ;; Guix does not need to prepare dependencies before testing.
+               (("test: prepare") "test:"))
              #t))
          (add-after 'fix-makefile 'chdir-elisp
            ;; Elisp directory is not in root of the source.
-- 
2.26.2