ongdisheng opened a new pull request, #34201:
URL: https://github.com/apache/superset/pull/34201

   <!---
   Please write the PR title following the conventions at 
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   Example:
   fix(dashboard): load charts correctly
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   ### SUMMARY
   <!--- Describe the change below, including rationale and design decisions -->
   #### Problem
   The image export process was based on the visible DOM snapshot, without 
accounting for overflowed (scrollable) content within the chart. 
   
   #### Solution
   To resolve the issue, a new utility function `hasScrollableDescendant()` was 
introduced. This function traverses the DOM tree of the target chart element to 
determine whether it contains any scrollable descendants.
   
   When scrollable content is detected, the chart element is cloned to preserve 
the original layout. The cloned element is then styled to expand its dimensions 
based on its `scrollHeight` and `scrollWidth`, ensuring the full content area 
is visible.
   
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   <!--- Skip this if not applicable -->
   #### Before
   ![top-15-languages-spoken-at-home-2025-07-15T04-39-44 
126Z](https://github.com/user-attachments/assets/1b62c836-e3e8-4a22-91ee-3fdc808e6364)
   
   #### After
   ![top-15-languages-spoken-at-home-2025-07-17T06-09-24 
126Z](https://github.com/user-attachments/assets/e672f901-2bfa-45a9-879a-61bad0fefd7b)
   
   
   ### TESTING INSTRUCTIONS
   <!--- Required! What steps can be taken to manually verify the changes? -->
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue: Fixes #33904 
   - [ ] Required feature flags:
   - [ ] Changes UI
   - [ ] Includes DB Migration (follow approval process in 
[SIP-59](https://github.com/apache/superset/issues/13351))
     - [ ] Migration is atomic, supports rollback & is backwards-compatible
     - [ ] Confirm DB migration upgrade and downgrade tested
     - [ ] Runtime estimates and downtime expectations provided
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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