[nautilus/wip/corey/dnd_features: 38/42] list-base: Fix hotspot for DnD drag icon

[Corey Berla <coreyberla src gnome org>]

commit c765b43031909f26fde6c76a35e8a97dbd6a4346
Author: Corey Berla <corey berla me>
Date:   Thu Aug 18 10:23:31 2022 -0700

    list-base: Fix hotspot for DnD drag icon
    
    We use a fixed size drag icon so we need to scale the drag icon
    accordingly.  The hotspot doesn't make sense for listview,
    and can produce very strange results, so simply set to 0,0.

 src/nautilus-list-base.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/src/nautilus-list-base.c b/src/nautilus-list-base.c
index 115f61bbd..a5e69f725 100644
--- a/src/nautilus-list-base.c
+++ b/src/nautilus-list-base.c
@@ -542,6 +542,7 @@ on_item_drag_prepare (GtkDragSource *source,
 {
     NautilusViewCell *cell = user_data;
     NautilusListBase *self = NAUTILUS_LIST_BASE (nautilus_view_cell_get_view (cell));
+    GtkWidget *view_ui;
     g_autolist (NautilusFile) selection = NULL;
     g_autoslist (GFile) file_list = NULL;
     g_autoptr (GdkPaintable) paintable = NULL;
@@ -574,6 +575,19 @@ on_item_drag_prepare (GtkDragSource *source,
 
     scale_factor = gtk_widget_get_scale_factor (GTK_WIDGET (self));
     paintable = get_paintable_for_drag_selection (selection, scale_factor);
+
+    view_ui = NAUTILUS_LIST_BASE_CLASS (G_OBJECT_GET_CLASS (self))->get_view_ui (self);
+    if (GTK_IS_GRID_VIEW (view_ui))
+    {
+        x = x * NAUTILUS_DRAG_SURFACE_ICON_SIZE / nautilus_list_base_get_icon_size (self);
+        y = y * NAUTILUS_DRAG_SURFACE_ICON_SIZE / nautilus_list_base_get_icon_size (self);
+    }
+    else if (GTK_IS_COLUMN_VIEW (view_ui))
+    {
+        x = 0;
+        y = 0;
+    }
+
     gtk_drag_source_set_icon (source, paintable, x, y);
 
     return gdk_content_provider_new_typed (GDK_TYPE_FILE_LIST, file_list);