[gtksourceview] testsuite: use installed relaxng schema for installed tests

[Christian Hergert <chergert src gnome org>]

commit 5a1ed614615cb6b9ca22f99b068722c62de8309f
Author: Christian Hergert <chergert redhat com>
Date:   Mon Sep 5 14:36:30 2022 -0700

    testsuite: use installed relaxng schema for installed tests
    
    If we are running out of tree, we still want to use languages and RelaxNG
    schema from the source tree. But if we do not have access to that, we can
    fallback to the installation prefix (which is now handled in
    GtkSourceLanguageManager).
    
    Fixes #287

 testsuite/test-languagemanager.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)
---
diff --git a/testsuite/test-languagemanager.c b/testsuite/test-languagemanager.c
index 0d7b4554..356d7289 100644
--- a/testsuite/test-languagemanager.c
+++ b/testsuite/test-languagemanager.c
@@ -23,6 +23,8 @@
 #include <gtk/gtk.h>
 #include <gtksourceview/gtksource.h>
 
+#include "gtksourceview/gtksourcelanguagemanager-private.h"
+
 #include "testsuite-gresources.h"
 
 /* If we are running from the source dir (e.g. during make check)
@@ -31,22 +33,25 @@
 static void
 init_default_manager (void)
 {
-       gchar *dir;
-
-       dir = g_build_filename (TOP_SRCDIR, "data", "language-specs", NULL);
+       char *dir = g_build_filename (TOP_SRCDIR, "data", "language-specs", NULL);
 
        if (g_file_test (dir, G_FILE_TEST_IS_DIR))
        {
                GtkSourceLanguageManager *lm;
-               gchar **lang_dirs;
+               char **lang_dirs;
+               char *rng = g_build_filename (dir, "language2.rng", NULL);
 
                lm = gtk_source_language_manager_get_default ();
 
                lang_dirs = g_new0 (gchar *, 2);
                lang_dirs[0] = dir;
 
+               _gtk_source_language_manager_set_rng_file (rng);
                gtk_source_language_manager_set_search_path (lm, (const gchar * const *)lang_dirs);
+
                g_strfreev (lang_dirs);
+               g_free (rng);
+
        }
        else
        {
@@ -201,12 +206,8 @@ test_resources (void)
        GtkSourceLanguageManager *lm = gtk_source_language_manager_new ();
        GtkSourceLanguage *l;
        GtkSourceBuffer *buffer;
-       const char * search_path[] = { "resource:///language-specs/", NULL, NULL };
+       const char * const search_path[] = { "resource:///language-specs/", NULL };
        const char * const *ids;
-       char *dir;
-
-       dir = g_build_filename (TOP_SRCDIR, "data", "language-specs", NULL);
-       search_path[1] = dir;
 
        g_resources_register (testsuite_get_resource ());
 
@@ -227,7 +228,6 @@ test_resources (void)
 
        g_object_unref (buffer);
        g_object_unref (lm);
-       g_free (dir);
 }
 
 static void