CMS iFrame Block does not resize

Build information: Istanbul Patch 10

Builds that are known NOT to be affected: N/A
The Environment: Browser(any)

Issue Description:
CMS iFrame Block does not resize on content change

Business Impact: Some

Investigations carried out so far and any findings:
Found PRB662540 which describes same similar issue, was closed as Can't Confirm. Was not sure if i should reopen that one or open a new one, decided to open a new one.
Reproducible on all supported releases

1 - Login as administrator.
2 - Import the attached XML files (sys_portal_preferences, sys_ui_page, content_block_iframe, content_page, sys_portal).
3 - Navigate to /ess/iframe_testing.do .
4 - Click anywhere inside the yellow block.

Observe the iFrame does not resize to fit content which is 500px. If you right click inside the yellow block and Open Frame > New Block > Yellow block, the iFrame will expand.

After carefully considering the severity and frequency of the issue, and the cost and risk of attempting a fix, it has been decided to not address this issue in any current or near future releases. We do not make these decisions lightly, and we apologize for any inconvenience.

As a workaround, edit the CSS of a style sheet associated with the theme, to set the 'min-height' of the iframe to some large value such as 5000px so that the full content is displayed.