desktop-ui kitten: Re-read config on every file chooser invocation via portal

Allows easily changing the config without needing to restart the kitten
which is difficult to do given its lifetime is managed by the xdg
portals service.

kittens/desktop_ui/main.go

@@ -30,7 +30,7 @@ func load_server_config(opts *ServerOptions) (ans *Config, err error) {
 func run_server(opts *ServerOptions) (err error) {
 	config, err := load_server_config(opts)
 	if err == nil {
-		portal, err := NewPortal(config)
+		portal, err := NewPortal(config, opts)
 		if err == nil {
 			err = portal.Start()
 			if err == nil {

kittens/desktop_ui/portal.go

@@ -65,6 +65,7 @@ type Portal struct {
 	settings                    SettingsMap
 	lock                        sync.Mutex
 	opts                        *Config
+	server_options              *ServerOptions
 	file_chooser_first_instance *exec.Cmd
 }
 
@@ -75,8 +76,8 @@ func to_color(spec string) (v dbus.Variant, err error) {
 	return
 }
 
-func NewPortal(opts *Config) (p *Portal, err error) {
-	ans := Portal{opts: opts}
+func NewPortal(opts *Config, server_options *ServerOptions) (p *Portal, err error) {
+	ans := Portal{opts: opts, server_options: server_options}
 	ans.settings = SettingsMap{
 		SETTINGS_CANARY_NAMESPACE: map[string]dbus.Variant{
 			SETTINGS_CANARY_KEY: dbus.MakeVariant("running"),
@@ -641,6 +642,14 @@ func (self *Portal) ReadAll(namespaces []string) (ReadAllType, *dbus.Error) {
 	return values, nil
 }
 
+func (self *Portal) reload_portal_settings() {
+	self.lock.Lock()
+	defer self.lock.Unlock()
+	if config, err := load_server_config(self.server_options); err == nil {
+		self.opts = config
+	}
+}
+
 type vmap map[string]dbus.Variant
 type Filter_expression struct {
 	Ftype uint32
@@ -726,6 +735,7 @@ type ChooserResponse struct {
 }
 
 func (self *Portal) run_file_chooser(cfd ChooseFilesData) (response uint32, result_dict vmap) {
+	self.reload_portal_settings()
 	response = RESPONSE_ENDED
 	tdir, err := os.MkdirTemp("", "kitty-cfd")
 	if err != nil {