list-base: Disable DND on FileChooser mode

Drag and drop to move files should be suppressed, as described on
https://gitlab.gnome.org/Teams/Design/os-mockups/-/issues/250

src/nautilus-files-view.c

@@ -9917,6 +9917,8 @@ create_inner_view (NautilusFilesView *self,
                    guint              id)
 {
     NautilusFilesViewPrivate *priv = nautilus_files_view_get_instance_private (self);
+    NautilusMode mode = nautilus_window_slot_get_mode (priv->slot);
+
     switch (id)
     {
         case NAUTILUS_VIEW_GRID_ID:
@@ -9944,6 +9946,11 @@ create_inner_view (NautilusFilesView *self,
         }
     }
 
+    if (mode != NAUTILUS_MODE_BROWSE)
+    {
+        nautilus_list_base_disable_dnd (priv->list_base);
+    }
+
     gtk_overlay_set_child (GTK_OVERLAY (priv->overlay), GTK_WIDGET (priv->list_base));
 }
 

src/nautilus-list-base.c

@@ -44,7 +44,9 @@ struct _NautilusListBasePrivate
     GtkWidget *overlay;
     GtkWidget *scrolled_window;
 
+    gboolean dnd_disabled;
     gboolean single_click_mode;
+
     gboolean activate_on_release;
     gboolean deny_background_click;
 
@@ -424,6 +426,11 @@ on_item_drag_prepare (GtkDragSource *source,
     GtkBitsetIter iter;
     guint i;
 
+    if (priv->dnd_disabled)
+    {
+        return NULL;
+    }
+
     /* Anticipate selection, if necessary, for dragging the clicked item. */
     select_single_item_if_not_selected (self, cell);
 
@@ -607,6 +614,12 @@ on_item_drag_enter (GtkDropTarget *target,
     /* Reset action cache. */
     priv->drag_item_action = 0;
 
+    if (priv->dnd_disabled)
+    {
+        gtk_drop_target_reject (target);
+        return 0;
+    }
+
     item = nautilus_view_cell_get_item (cell);
     if (item == NULL)
     {
@@ -733,6 +746,12 @@ on_view_drag_enter (GtkDropTarget *target,
     NautilusFile *dest_file = nautilus_list_base_get_directory_as_file (self);
     const GValue *value;
 
+    if (priv->dnd_disabled)
+    {
+        gtk_drop_target_reject (target);
+        return 0;
+    }
+
     value = gtk_drop_target_get_value (target);
     priv->drag_view_action = get_preferred_action (dest_file, value);
     if (priv->drag_view_action == 0)
@@ -1362,6 +1381,14 @@ nautilus_list_base_setup_gestures (NautilusListBase *self)
     priv->view_drop_target = drop_target;
 }
 
+void
+nautilus_list_base_disable_dnd (NautilusListBase *self)
+{
+    NautilusListBasePrivate *priv = nautilus_list_base_get_instance_private (self);
+
+    priv->dnd_disabled = TRUE;
+}
+
 /**
  * nautilus_list_base_get_backing_item:
  *

src/nautilus-list-base.h

@@ -50,6 +50,7 @@ struct _NautilusListBaseClass
                                        NautilusDirectory *directory);
 };
 
+void    nautilus_list_base_disable_dnd             (NautilusListBase *self);
 NautilusViewItem *nautilus_list_base_get_backing_item (NautilusListBase *self);
 GtkWidget *nautilus_list_base_get_selected_item_ui (NautilusListBase  *self);
 GVariant *nautilus_list_base_get_sort_state        (NautilusListBase  *self);