TYPO3 Core

If some extension creates the TSFE object in the BE (in our case this was done in a postProcessDatamap (tcemain hook)), then the styles are added to the TSFE and not the tcemain.

This was a bug in TYPO3 v4.2.10, checked out from this svn location:
https://svn.typo3.org/TYPO3v4/Core/tags/TYPO3_4-2-10

Now this is fixed by changing the following:

--- typo3/sysext/rtehtmlarea/class.tx_rtehtmlarea_base.php (revision 6623)
+++ typo3/sysext/rtehtmlarea/class.tx_rtehtmlarea_base.php (working copy)

@ -380,7 +380,7 @ * =======================================
*/
// Preloading the pageStyle and including RTE skin stylesheets
- if (is_object($GLOBALS['TSFE'])) {
+ if (is_object($GLOBALS['TSFE']) && TYPO3_MODE == 'FE') {
// Frontend editing
$GLOBALS['TSFE']->additionalHeaderData['rtehtmlarea-contentCSS'] = $this->getPageStyle();
$GLOBALS['TSFE']->additionalHeaderData['rtehtmlarea-skin'] = $this->getSkin();

(issue imported from #M12963)