[isaac-levine]

insert.chart with a range like A1:A5,E1:E5 only used the first area. build_chart goes through block(), which calls target_range(), and that keeps just the first parsed area. The command returned success but the pie came out empty.

Now build_chart reads every area. Areas must have the same height, otherwise the command returns an error instead of quietly plotting the first one. If the first area is a single text column, it becomes the categories and each later area supplies series, which is the Excel rule from the issue. Otherwise each area adds its own series. A Ctrl-selected multi-area selection with no range param takes the same path. Single-area behaviour is unchanged. New test: chart_from_multi_area_range_uses_every_area (the exact repro from the issue, plus the unequal-height error).

Commands run:

• cargo fmt --all -- --check: ok
• cargo clippy -p gridcraft-engine --all-targets -- -D warnings: clean
• cargo test -p gridcraft-engine: all pass (287 unit tests plus integration tests)
• cargo xtask layers: ok. cargo xtask wasm: ok

Not run: the full cargo xtask ci, and I did not look at the chart in the UI. insert.recommendedCharts shares build_chart, but the other commands the issue says may drop areas via target_range are not touched here.

Upstream issue: storytold#1638

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