[gnome-builder] code: add helper to bypass symlinks

[Christian Hergert <chergert src gnome org>]

commit 2a0b9d001bced15b388698336cc6c8cd8f28231a
Author: Christian Hergert <chergert redhat com>
Date:   Tue Mar 26 18:59:09 2019 -0700

    code: add helper to bypass symlinks
    
    This gives us an improved chance to check if files match after
    resolving their symlinks.

 src/libide/code/ide-buffer-private.h |  2 ++
 src/libide/code/ide-buffer.c         | 19 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)
---
diff --git a/src/libide/code/ide-buffer-private.h b/src/libide/code/ide-buffer-private.h
index a11df0f62..1f2f26984 100644
--- a/src/libide/code/ide-buffer-private.h
+++ b/src/libide/code/ide-buffer-private.h
@@ -41,6 +41,8 @@ IdeBuffer              *_ide_buffer_new                      (IdeBufferManager
                                                               gboolean              is_temporary);
 void                    _ide_buffer_attach                   (IdeBuffer            *self,
                                                               IdeObject            *parent);
+gboolean                _ide_buffer_is_file                  (IdeBuffer            *self,
+                                                              GFile                *nolink_file);
 void                    _ide_buffer_load_file_async          (IdeBuffer            *self,
                                                               IdeNotification      *notif,
                                                               GCancellable         *cancellable,
diff --git a/src/libide/code/ide-buffer.c b/src/libide/code/ide-buffer.c
index dfa5504c9..224832445 100644
--- a/src/libide/code/ide-buffer.c
+++ b/src/libide/code/ide-buffer.c
@@ -24,6 +24,7 @@
 
 #include <dazzle.h>
 #include <glib/gi18n.h>
+#include <libide-io.h>
 #include <libide-plugins.h>
 #include <libide-threading.h>
 
@@ -38,8 +39,9 @@
 #include "ide-file-settings.h"
 #include "ide-formatter.h"
 #include "ide-formatter-options.h"
-#include "ide-location.h"
+#include "ide-gfile-private.h"
 #include "ide-highlight-engine.h"
+#include "ide-location.h"
 #include "ide-range.h"
 #include "ide-source-iter.h"
 #include "ide-source-style-scheme.h"
@@ -80,6 +82,7 @@ struct _IdeBuffer
   IdeFileSettings        *file_settings;
   IdeHighlightEngine     *highlight_engine;
   GtkSourceFile          *source_file;
+  GFile                  *readlink_file;
 
   /* Scalars */
   guint                   change_count;
@@ -296,6 +299,8 @@ _ide_buffer_set_file (IdeBuffer *self,
   if (location == NULL || !g_file_equal (file, location))
     {
       gtk_source_file_set_location (self->source_file, file);
+      g_clear_object (&self->readlink_file);
+      self->readlink_file = _ide_g_file_readlink (file);
       ide_buffer_reload_file_settings (self);
       g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_FILE]);
       g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_TITLE]);
@@ -413,6 +418,7 @@ ide_buffer_finalize (GObject *object)
   IdeBuffer *self = (IdeBuffer *)object;
 
   g_clear_object (&self->source_file);
+  g_clear_object (&self->readlink_file);
   g_clear_pointer (&self->failure, g_error_free);
 
   G_OBJECT_CLASS (ide_buffer_parent_class)->finalize (object);
@@ -3798,3 +3804,14 @@ _ide_buffer_request_scroll_to_cursor (IdeBuffer *self)
 
   g_signal_emit (self, signals [REQUEST_SCROLL_TO_INSERT], 0);
 }
+
+gboolean
+_ide_buffer_is_file (IdeBuffer *self,
+                     GFile     *nolink_file)
+{
+  g_return_val_if_fail (IDE_IS_BUFFER (self), FALSE);
+  g_return_val_if_fail (G_IS_FILE (nolink_file), FALSE);
+
+  return g_file_equal (nolink_file, ide_buffer_get_file (self)) ||
+         g_file_equal (nolink_file, self->readlink_file);
+}