clear all cached sizes

oml/item/icons.py

@@ -82,6 +82,15 @@ class Icons(dict):
         c.close()
         conn.close()
 
+    def clear(self, prefix):
+        sql = 'DELETE FROM icon WHERE id LIKE ?'
+        conn = self.connect()
+        c = conn.cursor()
+        c.execute(sql, (prefix + '%', ))
+        conn.commit()
+        c.close()
+        conn.close()
+
 icons = Icons(icons_db_path)
 
 @run_async
@@ -122,9 +131,7 @@ def get_icon(id, type_, size, callback):
     callback(data)
 
 def clear_default_cover_cache():
-    for resolution in (64, 128, 256, 512, 1024):
-        key = '%s:%s:%s' % ('default', 'cover', resolution)
-        del icons[key]
+    icons.clear('default:cover:')
 
 @run_async
 def get_icon_app(id, type_, size, callback):