I need help how to managing Grid state. I can't find solution how to catch event drag when we are dragging the column's. Some example will be nice to have.
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Please see https://bryntum.com/docs/grid/#Grid/feature/ColumnReorder
Allows user to reorder columns by dragging headers. To get notified about column reorder listen to change event on columns store.
You can try this here: https://bryntum.com/examples/grid/state/
grid.columns.on('change', console.log)