[gnome-builder] sourceview: ignore not-supported warnings

[Christian Hergert <chergert src gnome org>]

commit a7b2266ae5590742dadf1afbac0bc471c5286e4e
Author: Christian Hergert <chergert redhat com>
Date:   Tue Sep 5 21:51:31 2017 -0700

    sourceview: ignore not-supported warnings

 libide/sourceview/ide-source-view.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/libide/sourceview/ide-source-view.c b/libide/sourceview/ide-source-view.c
index fcf7767..b763bf1 100644
--- a/libide/sourceview/ide-source-view.c
+++ b/libide/sourceview/ide-source-view.c
@@ -5927,7 +5927,10 @@ ide_source_view_format_selection_cb (GObject      *object,
   g_assert (G_IS_ASYNC_RESULT (result));
 
   if (!ide_buffer_format_selection_finish (buffer, result, &error))
-    g_warning ("%s", error->message);
+    {
+      if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED))
+        g_warning ("%s", error->message);
+    }
 
   gtk_text_view_set_editable (GTK_TEXT_VIEW (self), TRUE);