pub const RESIZE_HANDLE_WIDTH: f32 = 4.0;Expand description
Half-width of a column’s resize grip on the header strip.
The grabbable band is centred on the divider and reaches this far into the
cell on each side of it — 8 dp total, the same PM_HeaderGripMargin
convention QHeaderView uses. A one-sided band would leave the outer half
of every divider owned by the neighbouring cell’s label, where a grab that
missed by a pixel cycles the sort or starts a column-reorder drag instead.