Insert > Line or Area and the All Charts list offer 100% Stacked Area,
and insert.chart and chart.set take it as type area with subtype
stacked100. Each series' area stacks on the ones before it as its
share of the category's total. When every series on the value axis is
100% stacked and no value is negative, the axis runs from 0% to 100%.
A blank cell counts as zero, and a category whose total is zero stays
on the baseline.
An XLSX area chart with percentStacked grouping now opens as 100%
stacked and is saved back as percentStacked. It used to open as a
stacked area and was saved as stacked.
* CI: dev builds keep line tables only
* CI: one integration-test binary per crate
* CI: xtask runs tests with nextest, doctests apart, --keep-going on clippy and wasm
cargo xtask test runs the workspace tests (--lib --bins --tests) with cargo-nextest when it is installed, else cargo test, then the doctests. cargo xtask ci uses the same two steps.
* CI: docs name cargo xtask test
* CI: agent guides name the moved fuzz test
* CI: tests added on main join their crate's test binary
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