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See https://github.com/eclipse/eclipse.platform.resources/blob/master/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/events/AutoBuildJob.java#L143 If the shouldBuild method returns false, AutoBuildJob will fire the PRE_BUILD and POST_BUILD events although a workspace build isn't called. The original issue: https://github.com/redhat-developer/vscode-java/issues/996
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. As such, we're closing this bug. If you have further information on the current state of the bug, please add it and reopen this bug. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant. -- The automated Eclipse Genie.
See bug 573595 comment 11. This is not a bug, but an ancient API contract.