[gtk/popover-flip-arrow-fix] popover: Allocate after setting final_position

[Matthias Clasen <matthiasc src gnome org>]

commit 473709fee31a040b1fdbb36ebbee26f5bffabd68
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Apr 27 20:58:03 2020 -0400

    popover: Allocate after setting final_position
    
    When we find out that we've been flipped, set
    final_position and final_rect before allocating
    the popover. This prevents 'smashed-in beak' disease.
    
    Fixes: #2671

 gtk/gtkpopover.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkpopover.c b/gtk/gtkpopover.c
index 89e5912e66..7de2713771 100644
--- a/gtk/gtkpopover.c
+++ b/gtk/gtkpopover.c
@@ -379,11 +379,6 @@ update_popover_layout (GtkPopover     *popover,
     did_flip_vertically (gdk_popup_layout_get_surface_anchor (layout),
                          gdk_popup_get_surface_anchor (popup));
 
-  gtk_widget_allocate (GTK_WIDGET (popover),
-                       gdk_surface_get_width (priv->surface),
-                       gdk_surface_get_height (priv->surface),
-                       -1, NULL);
-
   priv->final_rect = final_rect;
 
   switch (priv->position)
@@ -405,6 +400,11 @@ update_popover_layout (GtkPopover     *popover,
       break;
     }
 
+  gtk_widget_allocate (GTK_WIDGET (popover),
+                       gdk_surface_get_width (priv->surface),
+                       gdk_surface_get_height (priv->surface),
+                       -1, NULL);
+
   g_clear_pointer (&priv->arrow_render_node, gsk_render_node_unref);
   gtk_widget_queue_draw (GTK_WIDGET (popover));
 }