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For large projects, validation is taking quite a while to execute, and it is also rather resource-heavy. It would make sense to be allow the user to turn it off, if he feels like it.
fixed: e1b667c3a8be ivoke "Properties" from the popup menu of a project: option "Allow background validation", true by default
due to bpel document can be opened without any project, the option is global for all projects.