eschutho commented on PR #39285:
URL: https://github.com/apache/superset/pull/39285#issuecomment-4636594328

   ## QA Verification — Pie/Donut Chart
   
   **Chart:** Total Revenue By Product (donut, ECharts canvas-based)
   **Commit:** \`50a33ae199dd456189ae8e221ffb8bd69f3ff50c\`
   **Result: ✅ PASS**
   
   | | Width | Height |
   |---|---|---|
   | Chart CSS dimensions | 243 px | 368 px |
   | Downloaded image | 550 px | 818 px |
   | Scale | 2.26× | 2.22× |
   
   The scale slightly exceeds 2× vs the CSS area because 
`processCloneForVisibility()` removes overflow constraints before rendering, 
expanding the clone. The output is well above 1× (what master produces), 
confirming `IMAGE_DOWNLOAD_SCALE = 2` is applied.
   
   Sales Dashboard with donut chart visible (bottom right):
   ![Sales 
Dashboard](https://raw.githubusercontent.com/eschutho/superset/image-download-scale-pr/qa-evidence/pr39285-pie-dashboard.png)
   
   Download menu:
   ![Download 
menu](https://raw.githubusercontent.com/eschutho/superset/image-download-scale-pr/qa-evidence/pr39285-pie-download-menu.png)
   
   Downloaded donut chart image (550×818 px):
   ![Downloaded donut 
chart](https://raw.githubusercontent.com/eschutho/superset/image-download-scale-pr/qa-evidence/pr39285-pie-downloaded-550x818.jpg)


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