RFR: 8205915: [macOS] Accelerator assigned to button in dialog fires menuItem in owning stage

[Kevin Rushforth]

On Thu, 13 Jan 2022 19:18:33 GMT, Martin Fox <duke at openjdk.java.net> wrote:

> When a window is closed while handling performKeyEquivalent the same NSEvent might be passed to the new key window causing it to being processed twice. Long ago a fix was put in for this case; when the GlassWindow was closed a flag was set to ensure that we would return YES from performKeyEquivalent. To fix RT-39813 the closing of the window was deferred causing the flag to be set too late. This PR simply sets that flag when we schedule the close event instead of when the OS actually closes the window.
> 
> This is a spot-fix for a larger problem, namely that we have no way of knowing whether a performKeyEquivalent event was consumed or not. The changes for fixing that are in PR #694. The changes got bundled into that PR only because there's a lot of files involved and the exact same code paths are touched.
> 
> System test is included (I'm surprised, it really is possible to generate Cmd+Enter using a Robot). This is new territory for me so I have a manual test I can submit as a backup.

This seems like a safe fix, and a candidate for fixing in JavaFX 18. If you are comfortable with the level of risk, then go ahead and change the target branch to `jfx18`.

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PR: https://git.openjdk.java.net/jfx/pull/715