fix: Fixes chart popover click outside when in iframe

[pan-kot]

Description

Rel: [AWSUI-61421]

How has this been tested?

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• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
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[pan-kot]

We use the same implementation in the internal popover component. The chart popover cannot use it because it imports the popover container instead.

[pan-kot]

The !nodeContains(container, event.target as Element) is a check that is chart-popover specific, and is taken from the prev. implementation - not from the internal popover. Its purpose is to prevent dismiss action in case the click is done within the chart's SVG so that the chart itself can define the appropriate popover behaviour in that case.

[pan-kot]

The blurTarget instanceof Element fails if the target belongs to a different document. As result, this if condition always resolves to true and thus causes the popover to be dismissed unexpectedly.

See:

Screen.Recording.2025-11-04.at.10.18.49.mov

Replacing the check with !isElement(blurTarget) fixes the problem.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.25%. Comparing base (4550381) to head (71e792d).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4005      +/-   ##
==========================================
+ Coverage   97.20%   97.25%   +0.05%     
==========================================
  Files         858      859       +1     
  Lines       25362    25390      +28     
  Branches     9016     9046      +30     
==========================================
+ Hits        24652    24693      +41     
+ Misses        704      691      -13     
  Partials        6        6              

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[pan-kot]

@gethinwebster I changed popover activation from pointer to keyboard because the former approach did not work with React 16 test pages: the page.hoverElement() did not help with offsetting the click. I did test the feature manually on both React versions.