[evolution] I#1961 - Missing divider lines and paddings under GNOME

[Milan Crha <mcrha src gnome org>]

commit 451e387ac0502131d797b11bd59b04c0650e9f4e
Author: Milan Crha <mcrha redhat com>
Date:   Mon Jul 18 11:34:39 2022 +0200

    I#1961 - Missing divider lines and paddings under GNOME
    
    Closes https://gitlab.gnome.org/GNOME/evolution/-/issues/1961

 src/shell/e-shell-window.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/src/shell/e-shell-window.c b/src/shell/e-shell-window.c
index 1a3f7d2b34..805e2d30fb 100644
--- a/src/shell/e-shell-window.c
+++ b/src/shell/e-shell-window.c
@@ -1163,10 +1163,17 @@ e_shell_window_init (EShellWindow *shell_window)
        gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
                GTK_STYLE_PROVIDER (css_provider),
                GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+       g_clear_object (&css_provider);
 
        /* If running on GNOME, force symbolic icons */
-       if (e_util_is_running_gnome ())
+       if (e_util_is_running_gnome ()) {
+               css_provider = gtk_css_provider_new ();
                gtk_css_provider_load_from_data (css_provider, css_icons, -1, NULL);
+               gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
+                       GTK_STYLE_PROVIDER (css_provider),
+                       GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+               g_clear_object (&css_provider);
+       }
 
        g_signal_connect (shell_window, "delete-event",
                G_CALLBACK (shell_window_delete_event_cb), NULL);