Cocoa: some mouse-wheel events are lost, if the handler is slow

• Lazarus/FPC Version: Lazarus 2.3.0 (rev main-2_3-776-gf49b54ba) FPC 3.2.3 x86_64-linux-gtk2
• Operating System: cross compile from Ubuntu 20 to macOS
• CPU / Bitness: 64

The original report from CudaText user is https://github.com/Alexey-T/CudaText/issues/3834

I made the demo which makes stable repro! Attached. User has macOS 11 or 12, and I confirm it on macOS 10.8 too. 2 screenshots are here https://github.com/Alexey-T/CudaText/issues/3834#issuecomment-972915478