language switcher module problem and SEF rewrite problems J 3.6.0 --> J 3.6.2

[ssnobben]

Steps to reproduce the issue

I have a test site updated to Joomla 3.6.2 from J 3.6.0.

After update to J 3.6.0 I have problems with the SEF rewrite multi language urls to work with a Joomla component.

The SEFs and rewrite works in Joomla 3.6.0 with the old J 3.6.0 site.php file and I have traced down this to an error in the file in \libraries\cms\application\site.php.

If I apply this old \libraries\cms\application\site.php file from Joomla 3.6.0 to the new J 3.6.2 site the SEFs for that Joomla component works b u t then instead the the Language Switcher module disappear.

Question: Is this a Joomla bug or what causes this behaviour that the Joomla language switcher disappears? What have changed between those two files?

Expected result

Language Module Switcher works and shows up as it should

Actual result

The Language Module Switcher doesnt show up

System information (as much as possible)

Joomla 3.6.0 and Joomla 3.6.2

Additional comments

See also #6253 #11470
Some previous things that could be related: https://www.ostraining.com/support-forum/joomla-support/language-code-url-causing-problems/

[brianteeman]

The last change to that file was in #9999
Can you replicate the issue on a clean install with no extensions and a default template?

[brianteeman]

I cannot replicate this see the screenshot and movie below

[ssnobben]

Hi well I got this to work after some testing back and forth with changing the System - Language Filter ordering to first with the System - Language Code after it before System - SEF plg.

So I dont know if this is a condition for the new code in J 3.6.2 that the System - Language Filter ordering to first before the System - SEF plgs. hmmm

[brianteeman]

Based on the comments on #9999 then I would agree that the changes made there have effected you

[andrepereiradasilva]

the order of the plugins is important.
the language filter now behaves like all other plugins.

See #10344

[brianteeman]

Closed as expected behaviour