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// returns frame of first actual change
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int HISTORY::registerChanges(int mod_type, int start, int end, int size, const char* comment, int consecutivenessTag, RowsSelection* frameset)
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// check if there are Input differences from latest snapshot
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int real_pos = (historyStartPos + historyCursorPos) % historySize;
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int first_changes = snap.inputlog.findFirstChange(snapshots[real_pos].inputlog, start, end);