[gnome-builder] IdeDiagnostic: set the location from range when unset

[Christian Hergert <chergert src gnome org>]

commit 4b2bf5a2e6dbc28c0c5fd0d692323be2d3185886
Author: Giovanni Campagna <gcampagn cs stanford edu>
Date:   Tue Feb 28 00:15:12 2017 -0800

    IdeDiagnostic: set the location from range when unset
    
    The gnome code assistance plugin creates an IdeDiagnostic object
    with no location, and then sets one or more IdeSourceRange's on it.
    
    We can assume that the first source range corresponds to where the
    problem is, and set the location based on it. Without a location,
    the diagnostic will be dropped on the floor, which is not nice.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779359

 libide/diagnostics/ide-diagnostic.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libide/diagnostics/ide-diagnostic.c b/libide/diagnostics/ide-diagnostic.c
index e35ed2b..ef9297f 100644
--- a/libide/diagnostics/ide-diagnostic.c
+++ b/libide/diagnostics/ide-diagnostic.c
@@ -268,6 +268,9 @@ ide_diagnostic_take_range (IdeDiagnostic  *self,
     self->ranges = g_ptr_array_new_with_free_func ((GDestroyNotify)ide_source_range_unref);
 
   g_ptr_array_add (self->ranges, range);
+
+  if (self->location == NULL)
+    self->location = ide_source_location_ref (ide_source_range_get_begin (range));
 }
 
 /**