iframe duplicates browser requests with SPA

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, Master
• Fix Version/s: 7.1.10 DXP FP13, 7.1.X, 7.2.10 DXP FP1, 7.2.1 CE GA2, 7.2.X, 7.3.10 DXP GA1, Master
• Component/s: Content Display Widgets > Iframe widget
• Labels:
  • ee-ts
  • liferay-fixpack-dxp-1-7210
  • liferay-fixpack-dxp-13-7110
• Branch Version/s:
  7.2.x, 7.1.x
• Backported to Branch:
  Committed
• Story Points: 0.25
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/74665

Steps To Reproduce:
(1) Add iframe portlet to a page.
(2) Configure to static external image like https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png
(3) Refresh page

Expected Result
browser sends 1 request for the image (networking dev tab)

Actual Result
browser sends 2 requests for the image (networking dev tab)

Master:4f0ab9ebc11e36cb841edee620313996a7f27123
71x:f94be38bdfdf6a2164ab3bebd209c486bde7a1e6
70x:6aff3ba3b96586c65082f510a7cc2f7d02fc55ac