'GetUserBlock': Modify the block found by the block manager. This may be a
single block or a composite block made from multiple blocks; the original
blocks can be seen using CompositeBlock::getOriginalBlocks()
'GetUserBlock': Modify the block found by the block manager. This may be a
single block or a composite block made from multiple blocks; the original
blocks can be seen using CompositeBlock::getOriginalBlocks()
&$block: AbstractBlock object
'getUserPermissionsErrors': Add a permissions error when permissions errors are
&$block: AbstractBlock object
'getUserPermissionsErrors': Add a permissions error when permissions errors are