[evolution] EHeaderBarButton: Disable the dropdown button with the main button

[Milan Crha <mcrha src gnome org>]

commit 2fd7eca161662511a0e68de67ac7a4c4613475ba
Author: Milan Crha <mcrha redhat com>
Date:   Wed Aug 3 07:27:29 2022 +0200

    EHeaderBarButton: Disable the dropdown button with the main button
    
    The dropdown part of the button should be insensitive together
    with the main button, to make it behave like a single widget.
    
    This could regress with the recent changes in the EHeaderBarButton.

 src/e-util/e-headerbar-button.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/src/e-util/e-headerbar-button.c b/src/e-util/e-headerbar-button.c
index 23a57e1d10..70dad04173 100644
--- a/src/e-util/e-headerbar-button.c
+++ b/src/e-util/e-headerbar-button.c
@@ -436,6 +436,11 @@ e_header_bar_button_take_menu (EHeaderBarButton *header_bar_button,
                gtk_box_pack_end (
                        GTK_BOX (header_bar_button), header_bar_button->priv->dropdown_button,
                        FALSE, FALSE, 0);
+
+               e_binding_bind_property (
+                       header_bar_button->priv->button, "sensitive",
+                       header_bar_button->priv->dropdown_button, "sensitive",
+                       G_BINDING_SYNC_CREATE);
        }
 
        gtk_menu_button_set_popup (GTK_MENU_BUTTON (header_bar_button->priv->dropdown_button), menu);