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When listing compiler errors in the Tasks window, and stepping through them with Ctrl+Dot/Comma, the caret is positioned at the beginning of the line containing the error, instead of directly on the error like with errors from the build output.
The tasklist has nothing in common with java/navigation. It is more an enhancement than an issue. Unfortunatelly the API (org.netbeans.spi.tasklist.Task) offfers only line number not position.