[gnome-desktop] thumbnail: Pass on G_MESSAGES_* envvar to thumbnailer

[Bastien Nocera <hadess src gnome org>]

commit 2947753ce5755ff3f153ad1ef55a3bb3e4829411
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Jan 16 16:35:32 2018 +0100

    thumbnail: Pass on G_MESSAGES_* envvar to thumbnailer
    
    Even if it is sandboxed.

 libgnome-desktop/gnome-desktop-thumbnail-script.c |   17 ++++++++++++-----
 1 files changed, 12 insertions(+), 5 deletions(-)
---
diff --git a/libgnome-desktop/gnome-desktop-thumbnail-script.c 
b/libgnome-desktop/gnome-desktop-thumbnail-script.c
index 0ac50f7..4fb13d6 100644
--- a/libgnome-desktop/gnome-desktop-thumbnail-script.c
+++ b/libgnome-desktop/gnome-desktop-thumbnail-script.c
@@ -131,6 +131,16 @@ add_args (GPtrArray *argv_array, ...)
   va_end (args);
 }
 
+static void
+add_env (GPtrArray  *array,
+         const char *envvar)
+{
+  if (g_getenv (envvar) != NULL)
+    add_args (array,
+              "--setenv", envvar, g_getenv (envvar),
+              NULL);
+}
+
 static char *
 get_extension (const char *path)
 {
@@ -518,11 +528,8 @@ add_bwrap (GPtrArray   *array,
            "--die-with-parent",
            NULL);
 
-#if 0
-  add_args (array,
-            "--setenv", "G_MESSAGES_DEBUG", "all",
-            NULL);
-#endif
+  add_env (array, "G_MESSAGES_DEBUG");
+  add_env (array, "G_MESSAGES_PREFIXED");
 
   /* Add gnome-desktop's install prefix if needed */
   if (g_strcmp0 (INSTALL_PREFIX, "") != 0 &&