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Milan Crha authored
This extends behaviour of left-clicking column header which is not used for sorting yet in an ETree/ETable in a way: a) alone left-click behaves like before, all current sorting is dropped and the ETree/ETable is sorted only by that column b) left-click with pressed Ctrl key adds the column as the first to sort by c) left-click with pressed Ctrl+Shift adds the column as the last to sort by
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