[gnome-builder/wip/gtk4-port] libide/code: add ide_diagnostic_equal()

[Christian Hergert <chergert src gnome org>]

commit 5b3ef5a0485273230a257f188b6c51b9ef4ff731
Author: Christian Hergert <chergert redhat com>
Date:   Fri May 20 14:36:53 2022 -0700

    libide/code: add ide_diagnostic_equal()

 src/libide/code/ide-diagnostic.c | 28 ++++++++++++++++++++++++++++
 src/libide/code/ide-diagnostic.h |  3 +++
 2 files changed, 31 insertions(+)
---
diff --git a/src/libide/code/ide-diagnostic.c b/src/libide/code/ide-diagnostic.c
index 1a377dfaf..fdee6b3f4 100644
--- a/src/libide/code/ide-diagnostic.c
+++ b/src/libide/code/ide-diagnostic.c
@@ -590,6 +590,34 @@ ide_diagnostic_hash (IdeDiagnostic *self)
   return priv->hash;
 }
 
+gboolean
+ide_diagnostic_equal (IdeDiagnostic *a,
+                      IdeDiagnostic *b)
+{
+  IdeDiagnosticPrivate *a_priv = ide_diagnostic_get_instance_private (a);
+  IdeDiagnosticPrivate *b_priv = ide_diagnostic_get_instance_private (b);
+
+  g_return_val_if_fail (!a || IDE_IS_DIAGNOSTIC (a), FALSE);
+  g_return_val_if_fail (!b || IDE_IS_DIAGNOSTIC (b), FALSE);
+
+  if (a == NULL || b == NULL)
+    return FALSE;
+
+  if (G_OBJECT_TYPE (a) != G_OBJECT_TYPE (b))
+    return FALSE;
+
+  if (ide_diagnostic_hash (a) != ide_diagnostic_hash (b))
+    return FALSE;
+
+  if (g_strcmp0 (a_priv->text, b_priv->text) != 0)
+    return FALSE;
+
+  if (!ide_location_equal (a_priv->location, b_priv->location))
+    return FALSE;
+
+  return TRUE;
+}
+
 /**
  * ide_diagnostic_to_variant:
  * @self: a #IdeDiagnostic
diff --git a/src/libide/code/ide-diagnostic.h b/src/libide/code/ide-diagnostic.h
index 7071533b0..9fc1a457d 100644
--- a/src/libide/code/ide-diagnostic.h
+++ b/src/libide/code/ide-diagnostic.h
@@ -63,6 +63,9 @@ IDE_AVAILABLE_IN_3_32
 IdeDiagnostic         *ide_diagnostic_new_from_variant     (GVariant              *variant);
 IDE_AVAILABLE_IN_3_32
 guint                  ide_diagnostic_hash                 (IdeDiagnostic         *self);
+IDE_AVAILABLE_IN_ALL
+gboolean               ide_diagnostic_equal                (IdeDiagnostic         *a,
+                                                            IdeDiagnostic         *b);
 IDE_AVAILABLE_IN_3_32
 IdeLocation           *ide_diagnostic_get_location         (IdeDiagnostic         *self);
 IDE_AVAILABLE_IN_3_32