[gtksourceview] Prevents C++ code to be spell checked

[Christian Hergert <chergert src gnome org>]

commit cdbdab9c8f29d856d098ec1ca00ca9b16fbcee0f
Author: Jordi Mas <jmas softcatala org>
Date:   Tue Apr 16 18:27:51 2019 +0200

    Prevents C++ code to be spell checked

 data/language-specs/cpp.lang | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/language-specs/cpp.lang b/data/language-specs/cpp.lang
index 6f6df953..3b19fbfd 100644
--- a/data/language-specs/cpp.lang
+++ b/data/language-specs/cpp.lang
@@ -116,7 +116,7 @@
         </context>
 
         <!-- actual language definition: C++-specific stuff plus everything from C -->
-        <context id="cpp">
+        <context id="cpp" class="no-spell-check">
             <include>
                 <context ref="cpp-proper"/>
                 <context ref="c:c"/>