[TYPO3-core] RFC #11410: Speed up BEgetRootLine by reusing parts of the rootline from the cache

[Michael Stucki]

Hi Rupi,

> but you're right: there's no measurable difference between --$c and $c--
> (in this case) so I'm fine with reverting it.

Committed to Trunk (rev. 5759)

Additionally, I also changed the if() statement as proposed by Xavier.

- michael

PS: Forge/SVN is veeeery slow today...
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