[gtk/matthiasc/for-master] dropdown: Make the popup as wide as the button

[Matthias Clasen <matthiasc src gnome org>]

commit 90b78132d4529d483138988d0f7d7b414643d008
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jun 11 18:29:58 2020 -0400

    dropdown: Make the popup as wide as the button
    
    Having narrow popups on a wide button looks awkward.
    Do the same as the combo box, and ensure the popup
    is at least as wide as the button.

 gtk/gtkdropdown.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gtk/gtkdropdown.c b/gtk/gtkdropdown.c
index 6674a8ba35..c0a37f4089 100644
--- a/gtk/gtkdropdown.c
+++ b/gtk/gtkdropdown.c
@@ -396,6 +396,8 @@ gtk_drop_down_size_allocate (GtkWidget *widget,
 
   gtk_widget_size_allocate (self->button, &(GtkAllocation) { 0, 0, width, height }, baseline);
 
+  gtk_widget_set_size_request (self->popup, width, -1);
+
   gtk_native_check_resize (GTK_NATIVE (self->popup));
 }