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To reproduce just click in the editor during scan. The problem exists from 6.7 but now it's visible due to deterministic progress. It's not only UI problem as it has performance overhead.
FIxed jet-main 86a484a9a0cf
Integrated into 'main-golden', will be available in build *201105111436* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/86a484a9a0cf User: Tomas Zezula <tzezula@netbeans.org> Log: #198456:Caret change causes index cancel and restart