Description Alexandr Miloslavskiy 2020-04-27 14:42:20 EDT

This happens even with the simplest snippets such as this:

----------------
public static void main(String[] args) {
	Display display = new Display();
	Shell shell = new Shell(display);

	shell.open();
	while (!shell.isDisposed()) {
		if (!display.readAndDispatch())
			display.sleep();
	}
	display.dispose();
}
----------------

Steps:
1) Start snippet
2) Try to click menu
3) Switch to some other app and back
4) Menu is now responsive.

I also managed to reproduce it with a simple native snippet:
----------------
#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject<NSApplicationDelegate>
{
}
@end

@implementation AppDelegate : NSObject
-(BOOL) applicationShouldTerminateAfterLastWindowClosed:(NSApplication*)app
{
    return YES;
}
@end

int main ()
{
    NSApplication* app = [NSApplication sharedApplication];
    // Appliaction should close when last window is closed
    AppDelegate* appDelegate = [[AppDelegate alloc] init];
    [app setDelegate:appDelegate];
    // Programs without application bundles and Info.plist files don't get a menubar and can't be brought to the front without this
    [app setActivationPolicy:NSApplicationActivationPolicyRegular];

    NSRect windowRect = NSMakeRect(0, 0, 200, 200);
    id window = [[NSWindow alloc]
        initWithContentRect: windowRect
        styleMask: NSWindowStyleMaskTitled | NSWindowStyleMaskClosable | NSWindowStyleMaskResizable | NSWindowStyleMaskMiniaturizable
        backing: NSBackingStoreBuffered
        defer:NO
        ];
    [window setTitle:[[NSProcessInfo processInfo] processName]];
    [window makeKeyAndOrderFront:nil];

    [app run];
    return 0;
}
----------------

Compile it with:
clang -framework snippet.m -o snippet

I also found reports in other places:
https://bugs.openjdk.java.net/browse/JDK-8233678
http://www.androwish.org/index.html/info/3583d49f8642eac557517123d6f573ae106e6ce9

The latter uses `[NSApp deactivate]` + `[NSApp activateIgnoringOtherApps: YES]` as workaround.