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saifulislamferoz
041c85060f
Add tests for previously-uncovered SparklineGroup setters (axis types, manual limits, additional display options and colours) and a hand-crafted Xlsx fixture exercising the reader's edge cases (non-sparkline ext, group without sparklines, sparkline with empty sqref, missing colour elements). Harden Reader/Xlsx/Sparklines against malformed input: guard the sparklineGroup and sparkline iterations against a null children set so an empty <x14:sparklineGroups> or <x14:sparklines> element no longer emits a PHP warning.