RFR: 8254841: [macos] Enter or Exit events are shouldn't be displayed while resizing [v2]

[Sergey Bylokhov]

On Tue, 14 Sep 2021 22:05:56 GMT, Alisen Chung <github.com+90066231+alisenchung at openjdk.org> wrote:

>> Added a resizing flag when the window is currently being resized to block mouseEntered and mouseExited events from being posted to that window.
>
> Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:
> 
>   added bug ID to test

I have a general question about this bug, initially the test was added for https://bugs.openjdk.java.net/browse/JDK-6479820 and that bug was fixed because of this:

When resizing the window by dragging a corner with the mouse,
the panel receives entry/exit mouse events randomly.
These events should not occur because the mouse is not entering
or exiting the window, it is dragging a corner of its border.


And in the current bug description:

`The window resizing is a bit slower than mouse movement. So before the window resize can catch up to the mouse, the mouse exits the window, then re-enters when the window catches up to it. This can be verified if you resize the window at the edge without entering the window: there will be no mouseEntered or mouseExit events. `

So situation is different, if the mouse is moved faster than window is moving, then I do not see why we should not post an events. Especially if the native system did that.

But the question is it really a problem of slow window, or may be we have some bug in the nativeSynthesizeMouseEnteredExitedEvents where we synthesize such events when we should not.

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PR: https://git.openjdk.java.net/jdk/pull/5497