Also auto-sort when document is saved to a new file

doc/geany.txt

@@ -530,8 +530,9 @@ Sorting tabs automatically
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Tabs can also be automatically sorted everytime a file or a group of
-files are opened.  This can be enabled in
-Preferences->Interface->Notebook tabs.  See `Editor tabs`_ section.
+files are opened, or when a document is saved to a new file.  This can
+be enabled in Preferences->Interface->Notebook tabs.  See `Editor tabs`_
+section.
 
 Cloning documents
 ^^^^^^^^^^^^^^^^^
@@ -1993,7 +1994,8 @@ Double-clicking hides all additional widgets
 
 Automatically sort tabs based on filename
     Whether to automatically sort editor tabs based on their filenames
-    everytime files are opened.
+    everytime files are opened, or when documents are saved to a new
+    file.
 
 Automatically sort tabs based on pathname
     Same as the one above but sort tabs based on pathname.  The result

src/notebook.c

@@ -67,6 +67,7 @@ static GtkWidget *switch_dialog = NULL;
 static GtkWidget *switch_dialog_label = NULL;
 
 static gboolean on_idle_auto_sort_hooked = FALSE;
+static gboolean doc_saves_to_new_file = FALSE;
 
 
 static void
@@ -84,6 +85,8 @@ notebook_tab_close_clicked_cb(GtkButton *button, gpointer user_data);
 static void setup_tab_dnd(void);
 
 static void on_document_open(GObject *obj, GeanyDocument *doc);
+static void on_document_before_save(GObject *obj, GeanyDocument *doc);
+static void on_document_save(GObject *obj, GeanyDocument *doc);
 
 
 static void update_mru_docs_head(GeanyDocument *doc)
@@ -551,6 +554,8 @@ void notebook_init(void)
 	g_signal_connect(main_widgets.window, "key-release-event", G_CALLBACK(on_key_release_event), NULL);
 
 	g_signal_connect(geany_object, "document-open", G_CALLBACK(on_document_open), NULL);
+	g_signal_connect(geany_object, "document-before-save", G_CALLBACK(on_document_before_save), NULL);
+	g_signal_connect(geany_object, "document-save", G_CALLBACK(on_document_save), NULL);
 
 	setup_tab_dnd();
 }
@@ -1006,6 +1011,24 @@ static void on_document_open(GObject *obj, GeanyDocument *doc)
 }
 
 
+static void on_document_before_save(GObject *obj, GeanyDocument *doc)
+{
+	doc_saves_to_new_file = doc->real_path == NULL;
+}
+
+
+static void on_document_save(GObject *obj, GeanyDocument *doc)
+{
+	if (doc_saves_to_new_file && interface_prefs.show_notebook_tabs)
+	{
+		if (interface_prefs.auto_sort_tabs_filename)
+			notebook_sort_tabs(NOTEBOOK_TAB_SORT_FILENAME);
+		else if (interface_prefs.auto_sort_tabs_pathname)
+			notebook_sort_tabs(NOTEBOOK_TAB_SORT_PATHNAME);
+	}
+}
+
+
 static void
 on_window_drag_data_received(GtkWidget *widget, GdkDragContext *drag_context,
 		gint x, gint y, GtkSelectionData *data, guint target_type,