eframe: Only call run_return twice on Windows
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The approach of emilk#1889 may remove observers in a view twice, which produces the Obj-C Exception: Cannot remove an observer <...> for the key path "nextResponder" from <WinitView ...> because it is not registered as an observer. The above message can only be seen when attaching the application to debugger. Users normally see: [1] *** trace trap cargo run This commit fixes it by only running `event_loop.run_return()` twice on Windows. Besides: * We have set `ControlFlow::Exit` on `Event::LoopDestroyed`, `EventResult::Exit` and on error; therefore, it is safe to not calling `set_exit()`. * This commit also fix the persistence function in macOS. It can't store the content in Memory due to this exception. Fixed: emilk#2768 (eframe: "App quit unexpectedly" on macOS) Signed-off-by: pan93412 <pan93412@gmail.com>
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run_return twice on Windows
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The approach of #1889 may remove observers in a view twice, which produces the Obj-C Exception:
The above message can only be seen when attaching the application to debugger. Users normally see:
This commit fixes it by only running
event_loop.run_return()twice on Windows. Besides:ControlFlow::ExitonEvent::LoopDestroyed,EventResult::Exitand on error; therefore, it is safe to not callingset_exit().Fixed: #2768 (eframe: "App quit unexpectedly" on macOS)
Exception Details
2023-06-04 13:01:02.034869+0800 review-tool[31446:18023641] [Window] Warning: Window WinitWindow 0x102536e60 ordered front from a non-active application and may order beneath the active application's windows. 2023-06-04T05:01:07.146383Z DEBUG eframe::native::epi_integration: Received WindowEvent::CloseRequested 2023-06-04T05:01:07.146439Z DEBUG eframe::native::epi_integration: App::on_close_event returned true 2023-06-04T05:01:07.146456Z DEBUG eframe::native::run: Asking to exit event loop… 2023-06-04T05:01:07.241007Z DEBUG eframe::native::run: Received Event::LoopDestroyed - saving app state… 2023-06-04T05:01:07.241041Z DEBUG eframe::native::run: eframe window closed 2023-06-04 13:01:34.963635+0800 review-tool[31446:18023641] [General] Cannot remove an observer <_NSTouchBarFinderObservation 0x10247fbb0> for the key path "nextResponder" from because it is not registered as an observer. 2023-06-04 13:01:35.012630+0800 review-tool[31446:18023641] [General] ( 0 CoreFoundation 0x00000001a1953154 __exceptionPreprocess + 176 1 libobjc.A.dylib 0x00000001a14724d4 objc_exception_throw + 60 2 Foundation 0x00000001a2846ff0 -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] + 628 3 Foundation 0x00000001a2846d28 -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] + 136 4 Foundation 0x00000001a28469f4 -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:context:] + 196 5 AppKit 0x00000001a50b2e90 -[_NSTouchBarFinderObservation invalidate] + 264 6 AppKit 0x00000001a50b41f0 ___NSTouchBarFinderSetNeedsUpdateOnMain_block_invoke_2 + 628 7 AppKit 0x00000001a4ba0c30 NSDisplayCycleObserverInvoke + 168 8 AppKit 0x00000001a4ba088c NSDisplayCycleFlush + 644 9 QuartzCore 0x00000001a8dbdce4 _ZN2CA11Transaction19run_commit_handlersE18CATransactionPhase + 120 10 QuartzCore 0x00000001a8dbcaa0 _ZN2CA11Transaction6commitEv + 320 11 AppKit 0x00000001a4c22c7c __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke + 272 12 AppKit 0x00000001a52fef7c ___NSRunLoopObserverCreateWithHandler_block_invoke + 64 13 CoreFoundation 0x00000001a18d99f0 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36 14 CoreFoundation 0x00000001a18d98dc __CFRunLoopDoObservers + 532 15 CoreFoundation 0x00000001a18d8f14 __CFRunLoopRun + 776 16 CoreFoundation 0x00000001a18d84b8 CFRunLoopRunSpecific + 612 17 HIToolbox 0x00000001ab122c40 RunCurrentEventLoopInMode + 292 18 HIToolbox 0x00000001ab1228d0 ReceiveNextEventCommon + 220 19 HIToolbox 0x00000001ab1227d4 _BlockUntilNextEventMatchingListInModeWithFilter + 76 20 AppKit 0x00000001a4af9d44 _DPSNextEvent + 636 21 AppKit 0x00000001a4af8ee0 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 716 22 AppKit 0x00000001a4aed344 -[NSApplication run] + 464 23 review-tool 0x00000001003b3e74 _ZN61_$LT$$LP$$RP$$u20$as$u20$objc2..message..MessageArguments$GT$8__invoke17he1b0068f4ccdd175E + 52 24 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_ZN3std10sys_common9backtrace28__rust_begin_short_backtrace17h2ee91cdb29921988E + 24 50 review-tool 0x000000010001b8b8 _ZN3std2rt10lang_start28_$u7b$$u7b$closure$u7d$$u7d$17h165a9106e93a887cE + 28 51 review-tool 0x0000000100624118 _ZN3std2rt19lang_start_internal17hd0038fc73979f110E + 648 52 review-tool 0x000000010001b884 _ZN3std2rt10lang_start17hc2f7452d664ffbaaE + 84 53 review-tool 0x0000000100011c98 main + 36 54 dyld 0x00000001a14a3f28 start + 2236 )