RFR: 8377350: [iOS] Add support for UIWindowScene [v3]

[Lukasz Kostyra]

On Thu, 12 Feb 2026 17:04:26 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

>> This PR adds support for iOS native window scene, which was added some time ago starting iOS 13 (in 2019).
>> 
>> Current iOS development requires iOS SDK 26, and minimum deployment target is set to iOS 15 (meaning that apps will run on all devices with iOS 15 or greater).
>> 
>> It is safe then to not include the safe-guard `if (@available(iOS 13.0, *)) {...}`, which will make the code more complex.
>> 
>> Adding the native UIScene and UIWindowScene APIs follows the Apple standards, but as a fallback, the deprecated API is still kept there (`keyWindow` was deprecated starting iOS 13, and `initWithFrame:` was deprecated starting iOS 26). This is for a follow-up issue.
>> 
>> Note: This patch doesn't really add support for multiple windows, as this would require more complex changes.
>
> Jose Pereda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update comment, and rename variable

I don't have a meaningful way to verify iOS changes, so I only looked through the diff. LGTM.

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Marked as reviewed by lkostyra (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/2072#pullrequestreview-3795584191