resize event needs to deferred until after page visibility becomes visible

[rniwa]

What is the issue with the HTML Standard?

See WebKit/WebKit#46590. We encountered a web compatibility issue on Google spreadsheet where dispatching resize event before visibilitychange event results in a bad rendering. The specification currently says to "run the resize steps" without regards to whether the page is currently visible or not but this behavior is not Web compatible. Web apps such as Google spreadsheet expects to receive resize event only after visibilitychange event had been fired to make the page visible first.

[Kaiido]

The step 3 of update the rendering is supposed to filter out hidden documents.