customize placeholder text and fix update bug

ui/dialogs/searchdialog.go

@@ -24,6 +24,8 @@ import (
 type SearchDialog struct {
 	widget.BaseWidget
 
+	PlaceholderText string
+
 	OnDismiss    func()
 	OnNavigateTo func(mediaprovider.ContentType, string)
 	OnSearched   func(string) []*mediaprovider.SearchResult
@@ -97,6 +99,13 @@ func (sd *SearchDialog) Show() {
 	sd.BaseWidget.Show()
 }
 
+func (sd *SearchDialog) Refresh() {
+	if sd.PlaceholderText != "" {
+		sd.searchEntry.SetPlaceHolder(sd.PlaceholderText)
+	}
+	sd.BaseWidget.Refresh()
+}
+
 func (sd *SearchDialog) onDismiss() {
 	if sd.OnDismiss != nil {
 		sd.OnDismiss()
@@ -267,7 +276,7 @@ func (s *searchResult) Update(result *mediaprovider.SearchResult) {
 	if result == nil {
 		return
 	}
-	if s.contentType == result.Type && s.id == result.ID {
+	if s.contentType == result.Type && s.id == result.ID && s.title.Text == result.Name {
 		return // nothing to do
 	}
 	s.id = result.ID

ui/dialogs/selectplaylist.go

@@ -35,6 +35,7 @@ func NewSelectPlaylistDialog(mp mediaprovider.MediaProvider, im util.ImageFetche
 		sp.onSearched,
 		sp.onInit,
 	)
+	sd.PlaceholderText = "Search playlists or new playlist name"
 	sp.SearchDialog = sd
 	return sp
 }