The framed report posts its content height to the parent so the Civi tab
can resize the iframe to fit. Two pieces interacted badly:
- The root layout sets html.h-full and body.min-h-full, so documentElement
and body heights track the iframe's viewport height.
- The parent template sets iframe.height = postedHeight + 24 every time
a height message arrives.
The combination produced an unbounded feedback loop: parent grows the
iframe by 24px, viewport grows, document height grows, ResizeObserver
fires, we post the new height, parent grows by another 24px. The outer
CiviCRM page scrollbar visibly shrank each cycle.
Fix on the report side (no extension change needed): when framed, override
html height to auto and body min-height to 0 so the document decouples
from the viewport. Observe body (the actual content), measure
body.scrollHeight, and skip posting when the value is unchanged. Original
styles are restored on unmount so route changes back to the standalone
view still work.
Joel Brock
38f4738eca