Avoid target directories within the source directory#29857

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Fleuv wants to merge 3 commits intosymfony:masterfrom

Commits on Jan 11, 2019

Skipping iterations in the mirror() method where the iterated file's path name is equal to the target path
Fleuv
committed
Added a new test what is called testMirrorAvoidCopyingTargetDirectoryIfInSourceDirectory
Fleuv
committed
Adjustments to comply with the Symfony Code Standards
Fleuv
committed