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c36e012926
When reporting in JSON format, we need to be able to find the 'last displayed row', not just 'last row' as we did before. This is used to decide whether to put the JSON_SEPARATOR (the ',' character) between the lines when reporting in JSON format. This is mainly important in case we use a combination of JSON format and a report marked with DM_REPORT_OUTPUT_MULTIPLE_TIMES flag. Such report may be reused several times with different selection criteria each time. In that case, the report always contains all lines in memory, even though some of them do not need to pass the selection criteria that are currently used. Without DM_REPORT_OUTPUT_MULTIPLE_TIMES flag, the report only contains the lines that have passed the selection criteria, so the this wasn't an issue in this case. Fix suggested by Lars Ellenberg and reported here: https://github.com/lvmteam/lvm2/issues/130