Keyboard 'Done' button is disabled but EarlGrey reports otherwise (and was able to click on it)

Hi,

Thanks for the great tool!

I'm trying to implement logic to check whether the soft keyboard's 'Done' button is enabled under certain circumstances (e.g. no input in UITextField). I use the following check:

```
let shouldEnable : Bool // true or false
let assertMatcher = shouldEnable ? grey_enabled() : grey_not(grey_enabled())
EarlGrey.select(elementWithMatcher: grey_accessibilityID("Done")).assert(with: assertMatcher)
```

The error is provided at the bottom, which should confirm that only 1 element is found, and it appears that it is indeed the keyboard's Done button. XCode's accessibility inspector reports that the enabled property of the button is 'false'.

Alternatively, I tried to do the following:
EarlGrey.select(elementWithMatcher: grey_accessibilityID("Done")).perform(grey_tap())

... and the test passes. I could see in the UI that the 'Done' button appeared to get pressed (appears selected), despite it being disabled/greyed out.

Please let me know if I'm missing something. Thanks.

The log below is for iOS11.1. Also had the same issue on iOS10.

Error below:
```
Exception Name: AssertionFailedException
Exception Reason: An assertion failed.
Exception with Assertion: {
"Assertion Criteria" : "assertWithMatcher:!((enabled && !(((kindOfClass('UIView') || respondsToSelector(accessibilityContainer)) && ancestorThatMatches(!(enabled))))))",
"Element Matcher" : "(respondsToSelector(accessibilityIdentifier) && accessibilityID('Done'))"
}

Exception Details: Error Trace: [
{
"Description" : "Assertion with matcher [M] failed: UI element [E] failed to match the following matcher(s): [S]",
"Description Glossary" : {
"M" : "!((enabled && !(((kindOfClass('UIView') || respondsToSelector(accessibilityContainer)) && ancestorThatMatches(!(enabled))))))",
"E" : "",
"S" : "!((enabled && !(((kindOfClass('UIView') || respondsToSelector(accessibilityContainer)) && ancestorThatMatches(!(enabled))))))"
},
"Error Domain" : "com.google.earlgrey.ElementInteractionErrorDomain",
"Error Code" : "3",
"File Name" : "GREYAssertions.m",
"Function Name" : "+[GREYAssertions grey_createAssertionWithMatcher:]_block_invoke",
"Line" : "75",
"TestCase Class" : "iOSClientTest.SingleInputFieldTest",
"TestCase Method" : "testTypeVoiceDictationIndicator"
}
]

Bundle ID: com.xxxxxxxx

Stack Trace: (
0 EarlGrey 0x0000000106e7e264 -[GREYDefaultFailureHandler handleException:details:] + 1972
1 EarlGrey 0x0000000106e65428 -[GREYElementInteraction grey_handleFailureOfAssertion:assertionError:userProvidedOutError:] + 10264
2 EarlGrey 0x0000000106e5f077 __39-[GREYElementInteraction assert:error:]_block_invoke + 2839
3 EarlGrey 0x0000000106e8d294 __59-[GREYUIThreadExecutor executeSyncWithTimeout:block:error:]_block_invoke + 68
4 EarlGrey 0x0000000106e3ea33 __77-[GREYRunLoopSpinner grey_drainRunLoopInActiveModeAndCheckCondition:forTime:]_block_invoke + 467
5 EarlGrey 0x0000000106e3f8f4 __89-[GREYRunLoopSpinner grey_setupObserverInMode:withBeforeSourcesBlock:beforeWaitingBlock:]_block_invoke + 180
6 CoreFoundation 0x000000010dec4d37 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
7 CoreFoundation 0x000000010dec4c8e __CFRunLoopDoObservers + 430
8 CoreFoundation 0x000000010dea9113 __CFRunLoopRun + 1251
9 CoreFoundation 0x000000010dea89b9 CFRunLoopRunSpecific + 409
10 EarlGrey 0x0000000106e3e503 -[GREYRunLoopSpinner grey_drainRunLoopInActiveModeAndCheckCondition:forTime:] + 627
11 EarlGrey 0x0000000106e3de6c -[GREYRunLoopSpinner spinWithStopConditionBlock:] + 588
12 EarlGrey 0x0000000106e8ca0e -[GREYUIThreadExecutor executeSyncWithTimeout:block:error:] + 1422
13 EarlGrey 0x0000000106e5da92 -[GREYElementInteraction assert:error:] + 2114
14 EarlGrey 0x0000000106e5f3ed -[GREYElementInteraction assertWithMatcher:error:] + 125
15 EarlGrey 0x0000000106e5f31e -[GREYElementInteraction assertWithMatcher:] + 62
16 iOSClientTest 0x000000012892f9e5 _T013iOSClientTest05BaseiaB0C18grey_check_enabledySo11GREYMatcher_p_SbtF + 229
17 iOSClientTest 0x000000012892fa79 _T013iOSClientTest05BaseiaB0C18grey_check_enabledySo11GREYMatcher_p_SbtFTo + 73
18 iOSClientTest 0x00000001289339db _T013iOSClientTest016SingleInputFieldB0C31testTypeVoiceDictationIndicatoryyF + 139
19 iOSClientTest 0x0000000128933a24 _T013iOSClientTest016SingleInputFieldB0C31testTypeVoiceDictationIndicatoryyFTo + 36
20 CoreFoundation 0x000000010dea649c __invoking___ + 140
21 CoreFoundation 0x000000010dea6370 -[NSInvocation invoke] + 320
22 EarlGrey 0x0000000106e53120 -[GREYTestCaseInvocation invoke] + 112
23 XCTest 0x000000012505b125 __24-[XCTestCase invokeTest]_block_invoke + 591
24 XCTest 0x00000001250a3a52 -[XCUITestContext performInScope:] + 183
25 XCTest 0x000000012505aecb -[XCTestCase invokeTest] + 141
26 EarlGrey 0x0000000106e45e99 -[XCTestCase(GREYAdditions) grey_invokeTest] + 1545
27 XCTest 0x000000012505be8c __26-[XCTestCase performTest:]_block_invoke.369 + 42
28 XCTest 0x00000001250a87f9 +[XCTContext runInContextForTestCase:block:] + 163
29 XCTest 0x000000012505b828 -[XCTestCase performTest:] + 608
30 XCTest 0x000000012505782e __27-[XCTestSuite performTest:]_block_invoke + 363
31 XCTest 0x0000000125057195 -[XCTestSuite _performProtectedSectionForTest:testSection:] + 26
32 XCTest 0x0000000125057392 -[XCTestSuite performTest:] + 239
33 XCTest 0x000000012505782e __27-[XCTestSuite performTest:]_block_invoke + 363
34 XCTest 0x0000000125057195 -[XCTestSuite _performProtectedSectionForTest:testSection:] + 26
35 XCTest 0x0000000125057392 -[XCTestSuite performTest:] + 239
36 XCTest 0x000000012505782e __27-[XCTestSuite performTest:]_block_invoke + 363
37 XCTest 0x0000000125057195 -[XCTestSuite _performProtectedSectionForTest:testSection:] + 26
38 XCTest 0x0000000125057392 -[XCTestSuite performTest:] + 239
39 XCTest 0x00000001250aff23 __44-[XCTTestRunSession runTestsAndReturnError:]_block_invoke + 40
40 XCTest 0x000000012506aa0e -[XCTestObservationCenter _observeTestExecutionForBlock:] + 475
41 XCTest 0x00000001250afdc2 -[XCTTestRunSession runTestsAndReturnError:] + 281
42 XCTest 0x0000000125046e87 -[XCTestDriver runTestsAndReturnError:] + 314
43 XCTest 0x00000001250a7a64 _XCTestMain + 619
44 CoreFoundation 0x000000010dec518c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
45 CoreFoundation 0x000000010dea996b __CFRunLoopDoBlocks + 203
46 CoreFoundation 0x000000010dea9144 __CFRunLoopRun + 1300
47 CoreFoundation 0x000000010dea89b9 CFRunLoopRunSpecific + 409
48 GraphicsServices 0x00000001157569c6 GSEventRunModal + 62
49 UIKit 0x000000010ff5c5e8 UIApplicationMain + 159
50 iOSClient 0x0000000105fe584f main + 111
51 libdyld.dylib 0x0000000113cd0d81 start + 1
52 ??? 0x0000000000000005 0x0 + 5
)

UI hierarchy (ordered by window level, front to back as rendered):

Legend: {
"[AX]" : "Accessibility",
"[UIE]" : "User Interaction Enabled",
"[Window 1]" : "Frontmost Window"
}

========== Window 1 ==========

|--
| |--
| | |--<_UIKBCompatInputView:0x7fc2cee83460; AX=N; AX.frame={{0, 451}, {375, 216}}; AX.activationPoint={187.5, 559}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 216}}; opaque; alpha=1>
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| | | | | |--<_UIBackdropEffectView:0x7fc2d3067a90; AX=N; AX.frame={{0, 451}, {375, 216}}; AX.activationPoint={187.5, 559}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 216}}; alpha=1; UIE=N>

========== Window 2 ==========

|--
| |--
| | |--<_UIRemoteKeyboardPlaceholderView:0x7fc2cefa9910; AX=N; AX.frame={{0, 451}, {375, 216}}; AX.activationPoint={187.5, 559}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 216}}; opaque; alpha=1>

========== Window 3 ==========

|--
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| | | | |--<_UIBarBackground:0x7fc2cef042e0; AX=N; AX.frame={{0, 618}, {375, 49}}; AX.activationPoint={187.5, 642.5}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 49}}; opaque; alpha=1; UIE=N>
| | | | | |--
| | | | | | |--<_UIVisualEffectSubview:0x7fc2cec4bca0; AX=N; AX.frame={{0, 618}, {375, 49}}; AX.activationPoint={187.5, 642.5}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 49}}; opaque; alpha=1; UIE=N>
| | | | | | |--<_UIVisualEffectBackdropView:0x7fc2cec33bf0; AX=N; AX.frame={{0, 618}, {375, 49}}; AX.activationPoint={187.5, 642.5}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 49}}; opaque; alpha=1; UIE=N>
| | | | | |--
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| | | | | | | |--<_UIToolbarContentView:0x7fc2d305b8b0; AX=N; AX.frame={{0, 667}, {375, 44}}; AX.activationPoint={187.5, 689}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 44}}; opaque; alpha=1>
| | | | | | | | |--<_UIButtonBarStackView:0x7fc2d30301f0; AX=N; AX.frame={{0, 667}, {375, 44}}; AX.activationPoint={187.5, 689}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 44}}; opaque; alpha=1>
| | | | | | | |--<_UIBarBackground:0x7fc2d3044b30; AX=N; AX.frame={{0, 667}, {375, 44}}; AX.activationPoint={187.5, 689}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 44}}; opaque; alpha=1; UIE=N>
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| | | | | | | | | |--<_UIVisualEffectSubview:0x7fc2d305b390; AX=N; AX.frame={{0, 667}, {375, 44}}; AX.activationPoint={187.5, 689}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 44}}; opaque; alpha=1; UIE=N>
| | | | | | | | | |--<_UIVisualEffectBackdropView:0x7fc2d303eb70; AX=N; AX.frame={{0, 667}, {375, 44}}; AX.activationPoint={187.5, 689}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 44}}; opaque; alpha=1; UIE=N>
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| | | | | | | |--<_UINavigationBarModernPromptView:0x7fc2cef61bf0; AX=N; AX.frame={{0, 20}, {0, 0}}; AX.activationPoint={0, 20}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {0, 0}}; opaque; hidden; alpha=0>
| | | | | | | | |--
| | | | | | | |--<_UINavigationBarContentView:0x7fc2cee30150; AX=N; AX.frame={{0, 20}, {375, 44}}; AX.activationPoint={187.5, 42}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {375, 44}}; opaque; alpha=1>
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| | | | | | | |--<_UINavigationBarLargeTitleView:0x7fc2cef61230; AX=N; AX.frame={{0, 20}, {0, 0}}; AX.activationPoint={0, 20}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {0, 0}}; opaque; hidden; alpha=1>
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| | | | | | | |--<_UIBarBackground:0x7fc2cee1d510; AX=N; AX.frame={{0, 0}, {375, 64}}; AX.activationPoint={187.5, 32}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, -20}, {375, 64}}; opaque; alpha=1; UIE=N>
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| | | | | | | | | | | |--<_UITableViewCellSeparatorView:0x7fc2cef83a10; AX=N; AX.frame={{15, 144.5}, {305, 0.5}}; AX.activationPoint={167.5, 144.75}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{15, 80.5}, {305, 0.5}}; opaque; alpha=1>
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| | | | | | | | | | | | | | | | | |--<_UITextFieldContentView:0x7fc2cef98160; AX=N; AX.frame={{16, 95.513671875}, {278, 42.486328125}}; AX.activationPoint={155, 116.7568359375}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{0, 0}, {278, 42.486328125}}; alpha=1; UIE=N>
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| | | | | | | | | | | |--<_UITableViewCellSeparatorView:0x7fc2d303ab10; AX=N; AX.frame={{15, 210.5}, {324, 0.5}}; AX.activationPoint={177, 210.75}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{15, 54.5}, {324, 0.5}}; opaque; alpha=1>
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| | | | | | | | | | | |--<_UITableViewCellSeparatorView:0x7fc2d3036590; AX=N; AX.frame={{15, 354.5}, {360, 0.5}}; AX.activationPoint={195, 354.75}; AX.traits='UIAccessibilityTraitNone'; AX.focused='N'; frame={{15, 89.5}, {360, 0.5}}; opaque; alpha=1>
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| |--
| | |--

Test Case '-[iOSClientTest.SingleInputFieldTest testTypeVoiceDictationIndicator]' failed (10.676 seconds).

```