Fix #515, column header misalignment #517
Merged
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Description
Bug fix for #515
If the column width isn't specified, the ColumnMetrics will recalculate the width and the left position of each of the columns. Originally, the column header was only triggering an update if the column width was changed, but not if the left position was changed.
This PR has changed the HeaderCell's shouldComponentUpdate method to return true if the column's left property has changed, and I've set up tests to confirm the behaviour of the shouldComponentUpdate method.
Does this PR introduce a breaking change? (check one with "x")