irc: reset filter and sort when /list buffer is closed (issue #1972)

tests/unit/plugins/irc/test-irc-list.cpp

@@ -284,6 +284,16 @@ TEST(IrcList, IrcListAlloc)
     LONGS_EQUAL(0, list->selected_line);
 }
 
+/*
+ * Tests functions:
+ *   irc_list_free_data
+ */
+
+TEST(IrcList, IrcListFreeData)
+{
+    /* TODO: write tests */
+}
+
 /*
  * Tests functions:
  *   irc_list_free