#4050 Config.header and Config.footer content disappears

[amagrude]

config.header.inc.php and config.footer.inc.php are broken for both included themes.

To reproduce:
Put any legal text, HTML or PHP into the file.

Problem #1:
First page render after login correct. Any subsequent page render except switching to another theme is wrong. Header and/or Footer text disappears.

This appears to be related to how how the AJAX does frame replacement as the HTML is still present in the source after the desired content disappears. No combination of HTML and/or JavaScript trickery has enabled the content of the either the config.header or the config.footer files to remain visible.

Problem #2:
Header included twice on login page. (Minor glitch. Included only for completeness)

[Michal Čihař]

This is caused by AJAX loading and already reported as [#3967].