[gtk+] headerbar: don't measure own size

[Matthias Clasen <matthiasc src gnome org>]

commit a8561bcc990a62452dc3b1ef70bf7ac327ced870
Author: Timm Bäder <mail baedert org>
Date:   Fri Jun 30 11:49:41 2017 +0200

    headerbar: don't measure own size
    
    This is fallout from an earlier commit, we should be checking the
    child's size of course, not repeatedly the headerbar's.

 gtk/gtkheaderbar.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkheaderbar.c b/gtk/gtkheaderbar.c
index f4bcda6..e415a4c 100644
--- a/gtk/gtkheaderbar.c
+++ b/gtk/gtkheaderbar.c
@@ -701,7 +701,7 @@ gtk_header_bar_compute_size_for_orientation (GtkWidget *widget,
 
       if (gtk_widget_get_visible (child->widget))
         {
-          gtk_widget_measure (widget, GTK_ORIENTATION_HORIZONTAL, avail_size,
+          gtk_widget_measure (child->widget, GTK_ORIENTATION_HORIZONTAL, avail_size,
                               &child_size, &child_natural, NULL, NULL);
 
           required_size += child_size;