[gnome-text-editor] window: allow dragging tab into new window

[Christian Hergert <chergert src gnome org>]

commit 0a074ae66d0510fda16646882fde225537446214
Author: Christian Hergert <chergert redhat com>
Date:   Tue Oct 26 15:19:42 2021 -0700

    window: allow dragging tab into new window
    
    You can just drag it out of the window now and a new window will be
    created on the fly.
    
    Related #199

 src/editor-window.c  | 18 ++++++++++++++++++
 src/editor-window.ui |  1 +
 2 files changed, 19 insertions(+)
---
diff --git a/src/editor-window.c b/src/editor-window.c
index bafc2d6..bb21597 100644
--- a/src/editor-window.c
+++ b/src/editor-window.c
@@ -522,6 +522,23 @@ on_notify_reveal_flap_cb (EditorWindow *self,
     adw_flap_set_locked (flap, TRUE);
 }
 
+static AdwTabView *
+on_tab_view_create_window_cb (EditorWindow *self,
+                              AdwTabView   *tab_view)
+{
+  EditorWindow *window;
+  AdwTabView *ret;
+
+  g_assert (EDITOR_IS_WINDOW (self));
+  g_assert (ADW_IS_TAB_VIEW (tab_view));
+
+  window = _editor_session_create_window_no_draft (EDITOR_SESSION_DEFAULT);
+  ret = window->tab_view;
+  gtk_window_present (GTK_WINDOW (window));
+
+  return ret;
+}
+
 static void
 editor_window_dispose (GObject *object)
 {
@@ -638,6 +655,7 @@ editor_window_class_init (EditorWindowClass *klass)
   gtk_widget_class_bind_template_callback (widget_class, on_tab_view_close_page_cb);
   gtk_widget_class_bind_template_callback (widget_class, on_notify_reveal_flap_cb);
   gtk_widget_class_bind_template_callback (widget_class, on_tab_view_setup_menu_cb);
+  gtk_widget_class_bind_template_callback (widget_class, on_tab_view_create_window_cb);
 
   gtk_widget_class_add_binding_action (widget_class, GDK_KEY_w, GDK_CONTROL_MASK, 
"win.close-page-or-window", NULL);
   gtk_widget_class_add_binding_action (widget_class, GDK_KEY_o, GDK_CONTROL_MASK, "win.open", NULL);
diff --git a/src/editor-window.ui b/src/editor-window.ui
index 2428fc4..7213c16 100644
--- a/src/editor-window.ui
+++ b/src/editor-window.ui
@@ -151,6 +151,7 @@
                         <property name="vexpand">true</property>
                         <signal name="close-page" handler="on_tab_view_close_page_cb" swapped="true"/>
                         <signal name="setup-menu" handler="on_tab_view_setup_menu_cb" swapped="true"/>
+                        <signal name="create-window" handler="on_tab_view_create_window_cb" swapped="true"/>
                       </object>
                     </child>
                   </object>