[network-manager-applet] applet: fix widget assertion failure when running as indicator

[Thomas Haller <thaller src gnome org>]

commit 360ad330ed2dc4c34a40e418a2a8c642459dd4f9
Author: Victor Kareh <vkareh redhat com>
Date:   Wed Dec 4 10:01:11 2019 -0500

    applet: fix widget assertion failure when running as indicator
    
    Fixes: dc9ee4e1129c ('applet: scale icons for HiDPI displays')
    
    https://gitlab.gnome.org/GNOME/network-manager-applet/merge_requests/74

 src/applet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/applet.c b/src/applet.c
index abf0c25c..7f0883e6 100644
--- a/src/applet.c
+++ b/src/applet.c
@@ -3001,7 +3001,7 @@ nma_icon_check_and_load (const char *name, NMApplet *applet)
        if (g_hash_table_lookup_extended (applet->icon_cache, name, NULL, (gpointer) &icon))
                return icon;
 
-       scale = gtk_widget_get_scale_factor (applet->context_menu);
+       scale = gdk_window_get_scale_factor (gdk_get_default_root_window ());
 
        /* Try to load the icon; if the load fails, log the problem, and set
         * the icon to the fallback icon if requested.