[nautilus] name-cell: Improve drop feedback on list view

[António Fernandes <antoniof src gnome org>]

commit 964192f0244fd296b2ae73ddf273263e1460a108
Author: António Fernandes <antoniof gnome org>
Date:   Thu Jun 30 16:52:36 2022 +0100

    name-cell: Improve drop feedback on list view
    
    Since the GtkDropTarget is set on each cell, the default active state
    (blue rectangle) is set only around a portion of the row in list view.
    We disabled the GTK_STATE_FLAG_DROP_ACTIVE for view-cell anyways,
    but we should have a better indication of drop state in list view since
    the icons are small.
    
    Heavily based on a different approach by Corey Berla

 src/nautilus-name-cell.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
---
diff --git a/src/nautilus-name-cell.c b/src/nautilus-name-cell.c
index 9a269ac68..55574cb0a 100644
--- a/src/nautilus-name-cell.c
+++ b/src/nautilus-name-cell.c
@@ -208,6 +208,21 @@ on_item_size_changed (NautilusNameCell *self)
 static void
 on_item_drag_accept_changed (NautilusNameCell *self)
 {
+    gboolean drag_accept;
+    NautilusViewItem *item;
+    GtkWidget *list_row = gtk_widget_get_parent (gtk_widget_get_parent (GTK_WIDGET (self)));
+
+    item = nautilus_view_cell_get_item (NAUTILUS_VIEW_CELL (self));
+    g_object_get (item, "drag-accept", &drag_accept, NULL);
+    if (drag_accept)
+    {
+        gtk_widget_set_state_flags (list_row, GTK_STATE_FLAG_DROP_ACTIVE, FALSE);
+    }
+    else
+    {
+        gtk_widget_unset_state_flags (list_row, GTK_STATE_FLAG_DROP_ACTIVE);
+    }
+
     update_icon (self);
 }