[nautilus/wip/antoniof/gtk4-preparation-drop-outgoing-api: 69/74] tree-view-drag-dest: Don't use gdk_window_get_position()

[António Fernandes <antoniof src gnome org>]

commit c9a5cf17488a48f2c124321a4730385c5e2dab07
Author: António Fernandes <antoniof gnome org>
Date:   Thu Aug 5 20:29:32 2021 +0100

    tree-view-drag-dest: Don't use gdk_window_get_position()
    
    It's gone in GTK4.
    
    Instead, translate to widget coordinates.

 src/nautilus-tree-view-drag-dest.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)
---
diff --git a/src/nautilus-tree-view-drag-dest.c b/src/nautilus-tree-view-drag-dest.c
index 01d080455..2a98181b4 100644
--- a/src/nautilus-tree-view-drag-dest.c
+++ b/src/nautilus-tree-view-drag-dest.c
@@ -593,7 +593,7 @@ drag_motion_callback (GtkWidget      *widget,
     GtkTreePath *path;
     GtkTreePath *drop_path, *old_drop_path;
     GtkTreeViewDropPosition pos;
-    GdkWindow *bin_window;
+    int bin_y;
     guint action;
     gboolean res = TRUE;
 
@@ -621,16 +621,13 @@ drag_motion_callback (GtkWidget      *widget,
     drop_path = get_drop_path (dest, path);
 
     action = 0;
-    bin_window = gtk_tree_view_get_bin_window (GTK_TREE_VIEW (widget));
-    if (bin_window != NULL)
+    gtk_tree_view_convert_bin_window_to_widget_coords (GTK_TREE_VIEW (widget),
+                                                       0, 0,
+                                                       NULL, &bin_y);
+    if (bin_y <= y)
     {
-        int bin_x, bin_y;
-        gdk_window_get_position (bin_window, &bin_x, &bin_y);
-        if (bin_y <= y)
-        {
-            /* ignore drags on the header */
-            action = get_drop_action (dest, context, drop_path);
-        }
+        /* ignore drags on the header */
+        action = get_drop_action (dest, context, drop_path);
     }
 
     gtk_tree_view_get_drag_dest_row (GTK_TREE_VIEW (widget), &old_drop_path,