From Bertrand: Fix issue when mixing canvases in batch and non-batch mode as reported on the forum:
From Bertrand:
Fix issue when mixing canvases in batch and non-batch mode as reported on the forum:

http://root.cern.ch/phpBB2/viewtopic.php?t=8578


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@29322 27541ba8-7e3a-0410-8455-c3a389f83636

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