[epiphany/alatiera/ele-stylesheet] hardcode elementary icons if on pantheon

[Jordan Petridis <jpetridis src gnome org>]

commit 2f8762401de06d469553c0054b1ea0bb9fa778da
Author: Jordan Petridis <jpetridis gnome org>
Date:   Thu Nov 12 16:13:19 2020 +0200

    hardcode elementary icons if on pantheon
    
    This makes it easier to test the Flatpak of ephy,
    under gnome and ensures we use the icons from
    the flatpak sandbox.

 src/ephy-shell.c | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/src/ephy-shell.c b/src/ephy-shell.c
index 2ee5684f4..6b78bb1eb 100644
--- a/src/ephy-shell.c
+++ b/src/ephy-shell.c
@@ -502,6 +502,15 @@ ephy_shell_startup (GApplication *application)
                                      app_entries, G_N_ELEMENTS (app_entries),
                                      application);
 
+    /* if we are under pantheon set the icon-theme and cursor theme accordingly */
+    if (is_desktop_pantheon ()) {
+      GtkSettings *settings = gtk_settings_get_default ();
+      g_object_set (settings,
+                    "gtk-icon-theme-name", "elementary",
+                    "gtk-cursor-theme-name", "elementary",
+                    NULL);
+    }
+
     if (mode != EPHY_EMBED_SHELL_MODE_INCOGNITO &&
         mode != EPHY_EMBED_SHELL_MODE_AUTOMATION) {
       g_action_map_add_action_entries (G_ACTION_MAP (application),