[TYPO3-core] RFC: #12614: Debug output destroys BE HTML

[Steffen Kamper]

Hi,

This is SVN patch request.

Type: Bugfix

Branches: trunk

BT reference: http://bugs.typo3.org/view.php?id=12614

Problem:
if you use t3lib_div::debug in BE the HTML is corrupted, docheader not 
clickable etc. It's very weird.

Reason is that t3lib_div::debug use "echo" which doesn't respect any output.

Solution:
use flash messages. Ensure that the flag "showFlashMessage" is 
respected, that modern modules with templates render their flashmessage 
in modulebody, that old modules get the flash messages too, that FE 
output shows debug too.

It also respect all settings and debug handlers, as t3lib_div::debug is 
used as "last" output of debug

vg Steffen
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