RFR: 8348744: Application window not always activated on macOS 15

[Kevin Rushforth]

On Tue, 28 Jan 2025 17:32:21 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

>> @jperedadnr can you add this comment to https://bugs.openjdk.org/browse/JDK-8348878 please?
>
> Done

> I'm not sure why [NSApp activateIgnoringOtherApps:YES]; works but [NSApp activate]; doesn't, given that the former is deprecated, as you already mentioned, and the latter is what Apple precisely [recommends](https://developer.apple.com/documentation/appkit/nsapplication/activate(ignoringotherapps:)?language=objc) to use instead.

The default activation mode is to only activate only when no other app is active, after first deactivating the launching application. This is true for the new `activate` method as well as the existing `activateWithOptions` method. `[NSApp activate]` is equivalent to `[NSApp activateIgnoringOtherApps:NO]`.

The `activateIgnoringOtherApps` method says this:

> By default, activation deactivates the calling app (assuming it was active), and then the new app is activated only if there’s no currently active application. This prevents the new app from stealing focus from the user, if the app is slow to activate and the user has switched to a different app in the interim. However, if you specify NSApplicationActivateIgnoringOtherApps, the application is activated regardless of the currently active app, potentially stealing focus from the user.

Let's continue looking into this in the context of [JDK-8348878](https://bugs.openjdk.org/browse/JDK-8348878).

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PR Review Comment: https://git.openjdk.org/jfx/pull/1685#discussion_r1932918326