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@ -1317,7 +1317,11 @@ void DrawDirtyBlocks()
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/* Wait a while and update _realtime_tick so we are given the rights */
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if (!IsFirstModalProgressLoop()) CSleep(MODAL_PROGRESS_REDRAW_TIMEOUT);
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_realtime_tick += MODAL_PROGRESS_REDRAW_TIMEOUT;
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/* Modal progress thread may need blitter access while we are waiting for it. */
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VideoDriver::GetInstance()->ReleaseBlitterLock();
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_modal_progress_paint_mutex->BeginCritical();
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VideoDriver::GetInstance()->AcquireBlitterLock();
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_modal_progress_work_mutex->BeginCritical();
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/* When we ended with the modal progress, do not draw the blocks.
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