Make the SGDB row insensitive if no API key

data/gtk/preferences.blp

@@ -234,7 +234,7 @@ template $PreferencesWindow : Adw.PreferencesWindow {
     Adw.PreferencesGroup sgdb_behavior_group {
       title: _("Behavior");
 
-      Adw.ActionRow {
+      Adw.ActionRow sgdb_switch_row {
         title: _("Use SteamGridDB");
         subtitle: _("Download images when adding or importing games");
         activatable-widget: sgdb_switch;

src/preferences.py

@@ -72,6 +72,7 @@ class PreferencesWindow(Adw.PreferencesWindow):
     sgdb_key_group = Gtk.Template.Child()
     sgdb_key_entry_row = Gtk.Template.Child()
     sgdb_switch = Gtk.Template.Child()
+    sgdb_switch_row = Gtk.Template.Child()
     sgdb_prefer_switch = Gtk.Template.Child()
     sgdb_animated_switch = Gtk.Template.Child()
 
@@ -188,6 +189,15 @@ class PreferencesWindow(Adw.PreferencesWindow):
             )
         )
 
+        def set_sgdb_sensitive(widget):
+            if not widget.get_text():
+                self.sgdb_switch.set_active(False)
+
+            self.sgdb_switch_row.set_sensitive(widget.get_text())
+
+        self.sgdb_key_entry_row.connect("changed", set_sgdb_sensitive)
+        set_sgdb_sensitive(self.sgdb_key_entry_row)
+
         # Switches
         self.bind_switches(
             (