[gtk/global-coords: 21/28] menu: Simplify function

[Matthias Clasen <matthiasc src gnome org>]

commit c3c327a82a94f63b23ebed361d05ac7cbfbfc003
Author: Benjamin Otte <otte redhat com>
Date:   Thu Apr 25 01:27:58 2019 +0200

    menu: Simplify function
    
    No need to do complicated math when we can just look at the allocation.

 gtk/gtkmenu.c | 33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)
---
diff --git a/gtk/gtkmenu.c b/gtk/gtkmenu.c
index a4bc6be307..a0929d3cc7 100644
--- a/gtk/gtkmenu.c
+++ b/gtk/gtkmenu.c
@@ -3521,30 +3521,19 @@ compute_child_offset (GtkMenu   *menu,
                       gint      *height)
 {
   GtkMenuPrivate *priv = menu->priv;
-  gint item_top_attach;
-  gint child_offset = 0;
-  gint i;
-
-  get_effective_child_attach (menu_item, &item_top_attach);
-
-  /* there is a possibility that we get called before _size_request,
-   * so check the height table for safety.
-   */
-  if (!priv->heights || priv->heights_length < gtk_menu_get_n_rows (menu))
-    return FALSE;
-
-  /* when we have a row with only invisible children, its height will
-   * be zero, so there's no need to check WIDGET_VISIBLE here
-   */
-  for (i = 0; i < item_top_attach; i++)
-    child_offset += priv->heights[i];
+  GtkAllocation allocation;
 
-  if (offset)
-    *offset = child_offset;
-  if (height)
-    *height = priv->heights[item_top_attach];
+  gtk_widget_get_allocation (menu_item, &allocation);
+  if (allocation.width > 0)
+    {
+      if (offset)
+        *offset = allocation.y + priv->scroll_offset;
+      if (height)
+        *height = allocation.height;
+      return TRUE;
+    }
 
-  return TRUE;
+  return FALSE;
 }
 
 static void