correctly clear searchbox when switching filelists

apps/files/js/filelist.js

@@ -1713,6 +1713,9 @@
 			if (OCA.Search.files) {
 				OCA.Search.files.setFileList(this);
 			}
+			if (OC.Search) {
+				OC.Search.clear();
+			}
 		},
 		/**
 		 * Update UI based on the current selection

search/js/search.js

@@ -229,6 +229,14 @@
 				$searchResults.find('tr.result').remove();
 				lastQuery = false;
 			};
+			this.clear = function() {
+				self.hideResults();
+				if(self.hasFilter(getCurrentApp())) {
+					self.getFilter(getCurrentApp())('');
+				}
+				$searchBox.val('');
+				$searchBox.blur();
+			};
 
 			/**
 			 * Event handler for when scrolling the list container.