Please retest (the test plan was improved).

Cosmetic comment fixes.

Fix for an exception on the configuration section for the "root" user.

When root opens a configuration section an exception is thrown:

Exception: Permission section not specified for prefix conf in ...\core\kernel\utility\event.php on line 439

Updated test plan.

The test plan doesn't include the removal of the Add permission for the Labels & Phrases section.

Not passed test plan part

Fixed fatal error on system setting saving for the root user.

In D486#9799, @erik wrote:

Test by plan is passed, but, to have Groups section visible, with root user go to Configuration->Users-General section, press Save button - and got "Exception: Permission section not specified for prefix conf in w:\SVN\5.2.x\core\kernel\utility\event.php on line 439"

Test by plan is passed, but, to have Groups section visible, with root user go to Configuration->Users-General section, press Save button - and got "Exception: Permission section not specified for prefix conf in w:\SVN\5.2.x\core\kernel\utility\event.php on line 439"

System log errors exists, but, seems, not related to the current patch. Equal errors count with patch and without patch.

Tested by using PHPStorm+XDebug with breakpoint in the SessionStorage::RemoveFromData method. Before patch applying SQL, that removes the priority_deleted session variable was executed. After patch applying SQL, that removes the priority_deleted session variable was not executed, because SessionSet property is set to false.

Removed excessive session update statement, that happens after it's creation.