canvas-item: use gtk_render_icon_surface for the DnD surface

So to get HiDpi support.

origin commit:
https://gitlab.gnome.org/GNOME/nautilus/commit/31059f33

libcaja-private/caja-icon-canvas-item.c

@@ -515,6 +515,7 @@ caja_icon_canvas_item_get_drag_surface (CajaIconCanvasItem *item)
     gboolean is_rtl;
     cairo_t *cr;
     GtkStyleContext *context;
+    cairo_surface_t *drag_surface;
 
     g_return_val_if_fail (CAJA_IS_ICON_CANVAS_ITEM (item), NULL);
 
@@ -540,14 +541,18 @@ caja_icon_canvas_item_get_drag_surface (CajaIconCanvasItem *item)
     width = EEL_CANVAS_ITEM (item)->x2 - EEL_CANVAS_ITEM (item)->x1;
     height = EEL_CANVAS_ITEM (item)->y2 - EEL_CANVAS_ITEM (item)->y1;
 
-    surface = gdk_window_create_similar_surface (gdk_screen_get_root_window (screen),
+    surface = gdk_window_create_similar_surface (gtk_widget_get_window (GTK_WIDGET (canvas)),
     						 CAIRO_CONTENT_COLOR_ALPHA,
     						 width, height);
 
     cr = cairo_create (surface);
 
-    gtk_render_icon (context, cr, item->details->pixbuf,
-                     item_offset_x, item_offset_y);
+    drag_surface = gdk_cairo_surface_create_from_pixbuf (item->details->pixbuf,
+                                                         gtk_widget_get_scale_factor (GTK_WIDGET (canvas)),
+                                                         gtk_widget_get_window (GTK_WIDGET (canvas)));
+    gtk_render_icon_surface (context, cr, drag_surface,
+                             item_offset_x, item_offset_y);
+    cairo_surface_destroy (drag_surface);
 
 
     icon_rect.x0 = item_offset_x;