Steps to reproduce the issue

I have Joomla settings:
public $sef = '1';
public $sef_rewrite = '1';
public $sef_suffix = '0';
public $unicodeslugs = '1';
In this case meta-tag "base" included href="http://www.mysite.ru/..." - the current page address. For example:

But not only http://www.mysite.ru/
To correct this bug must in file /libraries/src/Application/SiteApplication.php make the follow change in line 164:

Expected result

The meta-tag "base" included href="http://www.mysite.ru/"

Actual result

The meta-tag "base" included current page address href="http://www.mysite.ru/..."

System information (as much as possible)

Joomla 3.8x
Joomla settings:
public $sef = '1';
public $sef_rewrite = '1';
public $sef_suffix = '0';
public $unicodeslugs = '1';

Additional comments