Merge pull request #13217 from nextcloud/fix/ui/search-query-empty-string

fix(ui): build valid search query when toggling favorites sort

Author: kesselb

src/components/MailboxThread.vue

@@ -438,9 +438,9 @@ export default {
 
 		sortFavorites(enabled) {
 			if (enabled) {
-				this.searchQuery = this.searchQuery ? 'not:starred' : this.searchQuery + ' not:starred'
-			} else if (this.searchQuery.includes('not:starred')) {
-				this.searchQuery = this.searchQuery.replace('not:starred', '')
+				this.searchQuery = this.searchQuery ? this.searchQuery + ' not:starred' : 'not:starred'
+			} else if (this.searchQuery?.includes('not:starred')) {
+				this.searchQuery = this.searchQuery.replace('not:starred', '').trim() || undefined
 			}
 		},
 
@@ -513,7 +513,7 @@ export default {
 		},
 
 		appendToSearch(str) {
-			if (this.searchQuery === undefined) {
+			if (!this.searchQuery) {
 				return str
 			}