Bar chart stacked toggle has no effect — BarChartTransformer checks mark.stack instead of config.stacked

[Ju4n5e]

Bug Description

The Stacked toggle on bar charts (the layers icon in the chart context menu) has no effect. Bars always render side-by-side (grouped) regardless of the stacked setting.

Root Cause

In src/core/react/components/Visualization/transformers/BarChartTransformer.ts, line 140:

const isStacked = config.mark?.stack === true;

This checks config.mark.stack, but the UI toggle and the config parser (vizConfigFromProps) set the top-level config.stacked property — never config.mark.stack. So isStacked is always false.

The type definitions in src/shared/types/visualization.ts confirm both properties exist:

• mark.stack?: boolean (line 51) — never set by the UI
• stacked?: boolean (line 187) — set by the UI toggle

The legacy renderLegacy path in D3VisualizationEngine.tsx correctly checks the top-level stacked property, but the newer renderWithTransformedData path (which takes priority when transformedData exists) relies on BarChartTransformer, which only checks mark.stack.

Steps to Reproduce

1. Create a folder with notes that have a frontmatter property (e.g., Assignee)
2. Create a bar chart visualization with:
   • X field: Assignee
   • Y field: File with count aggregate
   • Color field: Priority (or any other property)
3. Toggle Stacked to On
4. Observe bars are still side-by-side (grouped), not stacked

Expected Behavior

Bars should stack on top of each other, segmented by the color field.

Suggested Fix

In BarChartTransformer.ts line 140, also check the top-level stacked property:

const isStacked = config.mark?.stack === true || config.stacked === true;

Environment

• make.md version: 1.3.5
• Obsidian: latest
• OS: macOS