[gnome-builder] vala: ensure vala loads the mapped file before parsing

[Christian Hergert <chergert src gnome org>]

commit a434f0585c636b557099e2fbc6ecfdaf0266f5b6
Author: Christian Hergert <christian hergert me>
Date:   Wed Apr 20 17:22:03 2016 -0700

    vala: ensure vala loads the mapped file before parsing
    
    I've been seeing some warnings about g_mapped_file_get_length() having
    a NULL mapped file. The error is in ValaSourceFile, so let's just force
    it to load the mapped file upfront.

 plugins/vala-pack/ide-vala-index.vala |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/plugins/vala-pack/ide-vala-index.vala b/plugins/vala-pack/ide-vala-index.vala
index 7251541..b85ba3e 100644
--- a/plugins/vala-pack/ide-vala-index.vala
+++ b/plugins/vala-pack/ide-vala-index.vala
@@ -282,6 +282,10 @@ namespace Ide
                                                if (!this.source_files.contains (file))
                                                        this.add_file (file);
 
+                                               /* Ensure vala has loaded the contents */
+                                               var source_file = this.source_files[file];
+                                               source_file.get_mapped_contents ();
+
                                                this.apply_unsaved_files (unsaved_files_copy);
                                                this.report.clear ();
                                                this.reparse ();