[libdazzle] suggestion-entry-buffer: add clear helper

[Christian Hergert <chergert src gnome org>]

commit 898d8c1cf91abbd9f1b21f0c6e1f382dea6f98d1
Author: Christian Hergert <chergert redhat com>
Date:   Thu Aug 9 12:10:18 2018 -0700

    suggestion-entry-buffer: add clear helper
    
    This can be used by the DzlSuggestionEntry to ensure that we clean the
    suggestion state so that it doesn't show up upon next focus.

 src/suggestions/dzl-suggestion-entry-buffer.c | 13 +++++++++++++
 src/suggestions/dzl-suggestion-entry-buffer.h |  2 ++
 2 files changed, 15 insertions(+)
---
diff --git a/src/suggestions/dzl-suggestion-entry-buffer.c b/src/suggestions/dzl-suggestion-entry-buffer.c
index 2f21ddd..3a56911 100644
--- a/src/suggestions/dzl-suggestion-entry-buffer.c
+++ b/src/suggestions/dzl-suggestion-entry-buffer.c
@@ -409,3 +409,16 @@ dzl_suggestion_entry_buffer_commit (DzlSuggestionEntryBuffer *self)
                                                                                       g_utf8_strlen (suffix, 
-1));
     }
 }
+
+void
+dzl_suggestion_entry_buffer_clear (DzlSuggestionEntryBuffer *self)
+{
+  DzlSuggestionEntryBufferPrivate *priv = dzl_suggestion_entry_buffer_get_instance_private (self);
+
+  g_return_val_if_fail (DZL_IS_SUGGESTION_ENTRY_BUFFER (self), NULL);
+
+  g_clear_pointer (&priv->text, g_free);
+  g_clear_pointer (&priv->suffix, g_free);
+  g_clear_object (&priv->suggestion);
+  g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_SUGGESTION]);
+}
diff --git a/src/suggestions/dzl-suggestion-entry-buffer.h b/src/suggestions/dzl-suggestion-entry-buffer.h
index 385804c..fd0f40a 100644
--- a/src/suggestions/dzl-suggestion-entry-buffer.h
+++ b/src/suggestions/dzl-suggestion-entry-buffer.h
@@ -55,6 +55,8 @@ DZL_AVAILABLE_IN_ALL
 guint                     dzl_suggestion_entry_buffer_get_typed_length (DzlSuggestionEntryBuffer *self);
 DZL_AVAILABLE_IN_ALL
 void                      dzl_suggestion_entry_buffer_commit           (DzlSuggestionEntryBuffer *self);
+DZL_AVAILABLE_IN_ALL
+void                      dzl_suggestion_entry_buffer_clear            (DzlSuggestionEntryBuffer *self);
 
 G_END_DECLS