Description
我们app内集成了zoom mac sdk。目前按照zoom通知，计划将zoom sdk升级到最新版。但升级后发现，在mac 10.14.x系统，输入法的候选字窗口不跟随光标，而是固定显示在屏幕左下角。
说明：
1、mac 10.15.x系统里是好的。
2、升级sdk前，没有这个问题。
3、无论是在我们app内使用比如简体拼音输入法输入内容，还是视频会议窗口-聊天里输入内容，都有这个问题。
Which version?
mac sdk : v4.6.21666.0427
To Reproduce(If applicable)
Steps to reproduce the behavior:
- Go to ‘…’
- Click on ‘…’
- Scroll down to ‘…’
- See error
Screenshots
Smartphone (please complete the following information):
- Device: MacBook Pro
- OS: mac os 10.14.5
抛出的异常：
2020-05-29 09:45:41.949436+0800 Teampel[8927:35095] firstRectForCharacterRange
2020-05-29 09:45:41.949631+0800 Teampel[8927:35095] [General] An uncaught exception was raised
2020-05-29 09:45:41.949647+0800 Teampel[8927:35095] [General] *** -[NSXPCEncoder _encodeObject:]: Unable to determine what Class the encoded object should encode (classForCoder returned nil)
2020-05-29 09:45:41.954208+0800 Teampel[8927:35095] [General] (
0 CoreFoundation 0x00007fff38d7e9a9 __exceptionPreprocess + 256
1 libobjc.A.dylib 0x00007fff6348aa17 objc_exception_throw + 48
2 CoreFoundation 0x00007fff38d7e7db +[NSException raise:format:] + 201
3 Foundation 0x00007fff3af40c13 -[NSXPCEncoder _encodeObject:] + 493
4 Foundation 0x00007fff3af4151c -[NSXPCEncoder _encodeArrayOfObjects:forKey:] + 225
5 Foundation 0x00007fff3af410f3 -[NSDictionary(NSDictionary) encodeWithCoder:] + 936
6 Foundation 0x00007fff3af40c68 -[NSXPCEncoder _encodeObject:] + 578
7 Foundation 0x00007fff3af4151c -[NSXPCEncoder _encodeArrayOfObjects:forKey:] + 225
8 Foundation 0x00007fff3af410f3 -[NSDictionary(NSDictionary) encodeWithCoder:] + 936
9 Foundation 0x00007fff3af40c68 -[NSXPCEncoder _encodeObject:] + 578
10 Foundation 0x00007fff3af1b383 _NSXPCSerializationAddInvocationWithOnlyObjectArgumentsArray + 139
11 Foundation 0x00007fff3af1b026 -[NSXPCEncoder _encodeInvocationObjectArgumentsOnly:count:typeString:selector:isReply:into:] + 183
12 Foundation 0x00007fff3af40308 _sendReplyArgumentsOnly + 217
13 Foundation 0x00007fff3b1edd44 __58-[NSXPCConnection _decodeAndInvokeMessageWithEvent:flags:]_block_invoke_2.97 + 94
14 Foundation 0x00007fff3af3ff4b -[_NSXPCConnectionRequestedReplies endTransactionForSequence:completionHandler:] + 185
15 Foundation 0x00007fff3b1edce0 __58-[NSXPCConnection _decodeAndInvokeMessageWithEvent:flags:]_block_invoke.96 + 133
16 HIToolbox 0x00007fff381a65c7 __65-[IMKInputSession attributesForCharacterIndex:completionHandler:]_block_invoke + 577
17 HIToolbox 0x00007fff381a5fb5 __77-[IMKInputSession attributesForCharacterIndex_andLineRect:completionHandler:]_block_invoke + 1968
18 HIToolbox 0x00007fff37f8ddb9 ___ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec_block_invoke + 110
19 AppKit 0x00007fff36ca784e __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke.456 + 459
20 AppKit 0x00007fff36ca75d5 __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke.438 + 633
21 AppKit 0x00007fff36cabff2 -[NSTextInputContext(NSInputContext_WithCompletion) attributedSubstringForProposedRange:completionHandler:] + 159
22 AppKit 0x00007fff36ca7347 __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke_5.433 + 95
23 AppKit 0x00007fff36ca3f02 -[NSTextInputContext tryHandleTSMEvent_attributedSubstringForProposedRange_withContext:dispatchCondition:dispatchWork:continuation:] + 86
24 AppKit 0x00007fff36ca72c3 __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke_3.431 + 373
25 AppKit 0x00007fff36ca70bb __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke_2.426 + 361
26 AppKit 0x00007fff36cac244 -[NSTextInputContext(NSInputContext_WithCompletion) firstRectForCharacterRange:completionHandler:] + 328
27 AppKit 0x00007fff36ca6f49 __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke.425 + 180
28 AppKit 0x00007fff36ca3d1f __178-[NSTextInputContext tryHandleTSMEvent_offsetToPos_markedOrSelRange_withContext:markedOrSelRangeDispatchCondition:markedRangeContinuation:selectedRangeContinuation:continuation:]_block_invoke + 72
29 AppKit 0x00007fff36ca3cca -[NSTextInputContext tryHandleTSMEvent_offsetToPos_markedOrSelRange_withContext:markedOrSelRangeDispatchCondition:markedRangeContinuation:selectedRangeContinuation:continuation:] + 169
30 AppKit 0x00007fff36ca6c03 __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke.408 + 259
31 AppKit 0x00007fff365dea89 -[NSTextInputContext handleTSMEvent:completionHandler:] + 1228
32 AppKit 0x00007fff365de545 _NSTSMEventHandler + 306
33 HIToolbox 0x00007fff37f2422e _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1422
34 HIToolbox 0x00007fff37f235df _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 371
35 HIToolbox 0x00007fff37f23465 SendEventToEventTargetWithOptions + 45
36 HIToolbox 0x00007fff37f8af8f SendTSMEvent_WithCompletionHandler + 383
37 HIToolbox 0x00007fff3812bf61 __SendTextInputEvent_WithCompletionHandler_block_invoke + 489
38 HIToolbox 0x00007fff3812a749 SendTextInputEvent_WithCompletionHandler + 1126
39 HIToolbox 0x00007fff3818e264 -[IMKInputSession _postEvent:completionHandler:] + 170
40 HIToolbox 0x00007fff3818e177 -[IMKInputSession _createAndSendOffsetToPointEvent:completionHandler:] + 290
41 HIToolbox 0x00007fff381a57de -[IMKInputSession attributesForCharacterIndex_andLineRect:completionHandler:] + 565
42 HIToolbox 0x00007fff381a6380 -[IMKInputSession attributesForCharacterIndex:completionHandler:] + 77
43 HIToolbox 0x00007fff3818fcdc __60-[IMKInputSession imkxpc_attributesForCharacterIndex:reply:]_block_invoke + 478
44 CoreFoundation 0x00007fff38d04df8 CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK + 12
45 CoreFoundation 0x00007fff38cc8517 __CFRunLoopDoBlocks + 394
46 CoreFoundation 0x00007fff38cc8274 __CFRunLoopRun + 2772
47 CoreFoundation 0x00007fff38cc754e CFRunLoopRunSpecific + 455
48 HIToolbox 0x00007fff37f71867 -[IMKInputSessionXPCInvocation invocationAwaitXPCReply] + 551
49 HIToolbox 0x00007fff38180811 __49-[IMKInputSession handleEvent:completionHandler:]_block_invoke_2.441 + 1575
50 HIToolbox 0x00007fff3817fd0b __49-[IMKInputSession handleEvent:completionHandler:]_block_invoke_2.411 + 449
51 HIToolbox 0x00007fff3816e0f2 -[IMKClient switchedInputMode:completionHandler:] + 400
52 HIToolbox 0x00007fff3817ece6 -[IMKInputSession tryHandleEventSwitchedInputMode:eventWasHandled:continuationHandler:] + 116
53 HIToolbox 0x00007fff3817fb08 __49-[IMKInputSession handleEvent:completionHandler:]_block_invoke.410 + 205
54 HIToolbox 0x00007fff3817f944 __49-[IMKInputSession handleEvent:completionHandler:]_block_invoke + 271
55 HIToolbox 0x00007fff3818ad5b -[IMKInputSession _eventIsOn:completionHandler:] + 2085
56 HIToolbox 0x00007fff3817f1c8 -[IMKInputSession handleEvent:completionHandler:] + 823
57 HIToolbox 0x00007fff3813ab8c IMKInputSessionProcessEventRefWithCompletionHandler + 114
58 HIToolbox 0x00007fff3813a2fe InputMethodInstanceProcessEventRef_WithCompletionHandler + 122
59 HIToolbox