v1.3.0

Added

• Header groups fold: columnGroupShow swaps detail columns for a summary one, and
  collapseMode: 'rail' takes the whole group away behind a drawer the height of the grid.
  Every level has its own toggle, the fold is on the keyboard and in the snapshot.
• A filter row under the header: filtering({ floatingRow: true }), one control per column
  type, sharing the column's single filter panel.
• GridFeature.cellValue stands between a cell's value and every way it leaves the grid:
  render, export, clipboard, quick filter, set filter and the editor's draft.
• CellDecoration.style writes CSS declarations per cell, custom properties included, so a
  feature can paint a value it computes rather than pick from a fixed set of classes.
• DataGridLabels.anyValue and DataGridLabels.filterRowValue, in all twelve packs.

Changed

• A date condition in the filter panel is picked with the grid's date picker rather than the
  browser's own control.

Fixed

• A date typed one segment at a time is the date that was typed, and a year under a hundred
  is that year, not nineteen-hundred-and-it.
• A row edit commits only the columns that row may edit.
• One filter panel per column, wherever it was opened from.
• Focus stands where the grid still draws: putting the focused column away used to leave the
  grid with no tab stop at all.

Full detail in the CHANGELOG.