[Webkit-unassigned] [Bug 192564] Regression (iOS 12): Keyboard dismissal leaves WKWebView viewport-fit=cover content offscreen

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192564

--- Comment #6 from Darryl Pogue <dvpdiner2 at gmail.com> ---
(In reply to Ryosuke Niwa from comment #5)
> (In reply to David Gölzhäuser from comment #4)
> > This issue only occurs in combination with iOS >= 12 and XCode >=10. Apple
> > requires developers to build Apps with iOS 12.1 and Xcode 10.1 on March 2019.
> 
> Hm... that's strange. Xcode version itself shouldn't affect things. Are you
> also changing the target SDK when you do that? If so, could you tell us in
> which target SDK you're seeing the issue in iOS 12?
> 
> There are certain features and behaviors we enable only when an app is
> linked against newer SDKs. So if this problem only occurs with newer SDKs,
> then I suspect one of those features / behaviors are the cause of it.

This bug only happens when building against the iOS 12 SDKs.

This matches the comments in the https://trac.webkit.org/changeset/233905/webkit

> UIScrollView's _systemContentInset no longer includes keyboard insets
in apps linked on iOS 12+ when contentInsetAdjustmentBehavior is None.

> FirstWhereUIScrollViewDoesNotApplyKeyboardInsetsUnconditionally = DYLD_IOS_VERSION_12_0,

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