[Webkit-unassigned] [Bug 237675] New: Incorrect innerHeight IOS 15 Tabs "Single Tab" setting

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237675

            Bug ID: 237675
           Summary: Incorrect innerHeight IOS 15 Tabs "Single Tab" setting
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dbucholtz at twitter.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 454284

  --> https://bugs.webkit.org/attachment.cgi?id=454284&action=review

Video of bug on iPhone 13 Pro

The `window.innerHeight` is not always correct in Safari 15 when the Safari setting for Tabs is set to `Single Tab`

Here is a very simple isolated example to demonstrate the issue:

https://ios-safari-scroll-position-bug.glitch.me/

Pre-reqs:
1. Using iOS 15
2. From Settings.app, In the Safari Settings, Set the `Tabs` setting to "Single Tab"

Repo steps:
1. Navigate to a web page that is tall enough to have scrolling enabled.
2. Scroll down enough such that the bottom safari "chrome" collapses
3. Click on a link/button to get to a page that's not tall enough to be scrollable


Expected behavior:

The Safari browser bottom "chrome" will remain collapsed, and `window.innerHeight` will give the correct value

Actual behavior:

The safari browser bottom "chrome" remains collapsed, but the `window.innerHeight` value is less than it should be





Additional notes:

1. You must be on a page long enough to scroll so that the bottom browser chrome collapses
2. The only way to get into this state if you have the nav bar collapsed on a previous scrollable page and then navigate to a page that is not scrollable

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