[spreadsheet] use fixed DateTimes instead of QDateTime::currentDateTime()
Description
Used fixed DateTimes instead of QDateTime::currentDateTime() in SpreadsheetGenerateDataTest to have reproducible (and more reliable?) test results.
Conformity
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Changelog entry -
Unit tests -
Update INSTALL -
Downport - Fixes: trying to fix the failing tests in the windows Qt65 build.
When external dependencies are removed
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Reporting to ...