[Webkit-unassigned] [Bug 163506] New: REGRESSION (Safari 10-Safari Technology Preview 15): Crash when pressing Caps Lock if “Use the Caps Lock key to switch to and from U?=.S.=?UTF-8?Q?” is selected in Input Sources preferences

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163506

            Bug ID: 163506
           Summary: REGRESSION (Safari 10-Safari Technology Preview 15):
                    Crash when pressing Caps Lock if “Use the Caps Lock
                    key to switch to and from U.S.” is selected in Input
                    Sources preferences
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: macOS 10.12
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: Event Handling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mitz at webkit.org

<rdar://problem/28792483>

To reproduce:
1. In System Preferences > Keyboard > Input Sources, select “Use the Caps Lock key to switch to and from U.S.”
2. In Safari or in MiniBrowser, focus the webpage and press the Caps Lock key

Result:
An Objective-C exception (Invalid message sent to event "NSEvent: type=FlagsChanged loc=(-307.102,1057.25) time=1336829.1 flags=0x100 win=0x6080001e0900 winNum=34673 ctxt=0x0 keyCode=255") is raised:

#0    0x00007fffcbd1dc7d in objc_exception_throw ()
#1    0x00007fffb764a232 in +[NSException raise:format:arguments:] ()
#2    0x00007fffb907d390 in -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] ()
#3    0x00007fffb53e678c in -[NSEvent characters] ()
#4    0x0000000108f8480a in WebCore::keyForKeyEvent(NSEvent*) at Source/WebCore/platform/mac/PlatformEventFactoryMac.mm:277
#5    0x0000000100730fac in WebKit::WebEventFactory::createWebKeyboardEvent(NSEvent*, bool, bool, WTF::Vector<WebCore::KeypressCommand, 0ul, WTF::CrashOnOverflow, 16ul> const&) at Source/WebKit2/Shared/mac/WebEventFactory.mm:481
#6    0x00000001002b0458 in WebKit::NativeWebKeyboardEvent::NativeWebKeyboardEvent(NSEvent*, bool, bool, WTF::Vector<WebCore::KeypressCommand, 0ul, WTF::CrashOnOverflow, 16ul> const&) at Source/WebKit2/Shared/mac/NativeWebKeyboardEventMac.mm:39
#7    0x00000001002b070b in WebKit::NativeWebKeyboardEvent::NativeWebKeyboardEvent(NSEvent*, bool, bool, WTF::Vector<WebCore::KeypressCommand, 0ul, WTF::CrashOnOverflow, 16ul> const&) at Source/WebKit2/Shared/mac/NativeWebKeyboardEventMac.mm:41
#8    0x0000000100bbd1ca in ::___ZN6WebKit11WebViewImpl12flagsChangedEP7NSEvent_block_invoke(BOOL, const WTF::Vector<WebCore::KeypressCommand, 0, WTF::CrashOnOverflow, 16> &) at Source/WebKit2/UIProcess/Cocoa/WebViewImpl.mm:3945
#9    0x0000000100bba080 in WebKit::WebViewImpl::interpretKeyEvent(NSEvent*, void (signed char, WTF::Vector<WebCore::KeypressCommand, 0ul, WTF::CrashOnOverflow, 16ul> const&) block_pointer) at Source/WebKit2/UIProcess/Cocoa/WebViewImpl.mm:3512
#10    0x0000000100bbd0f4 in WebKit::WebViewImpl::flagsChanged(NSEvent*) at Source/WebKit2/UIProcess/Cocoa/WebViewImpl.mm:3944
#11    0x0000000100ca8016 in ::-[WKWebView flagsChanged:](NSEvent *) at Source/WebKit2/UIProcess/API/Cocoa/WKWebView.mm:2699

In WebKit1 MiniBrowser windows, this is preceded by an assertion failure:

#0    0x0000000104d14e64 in ::WTFCrash() at /Projects/Safari/OpenSource/Source/WTF/wtf/Assertions.cpp:323
#1    0x0000000108f85ff6 in WebCore::keyIdentifierForKeyEvent(NSEvent*) at /Projects/Safari/OpenSource/Source/WebCore/platform/mac/PlatformEventFactoryMac.mm:529
#2    0x0000000108f87b6c in WebCore::PlatformKeyboardEventBuilder::PlatformKeyboardEventBuilder(NSEvent*) at /Projects/Safari/OpenSource/Source/WebCore/platform/mac/PlatformEventFactoryMac.mm:839
#3    0x0000000108f8666d in WebCore::PlatformKeyboardEventBuilder::PlatformKeyboardEventBuilder(NSEvent*) at /Projects/Safari/OpenSource/Source/WebCore/platform/mac/PlatformEventFactoryMac.mm:830
#4    0x0000000108f86600 in WebCore::PlatformEventFactory::createPlatformKeyboardEvent(NSEvent*) at /Projects/Safari/OpenSource/Source/WebCore/platform/mac/PlatformEventFactoryMac.mm:875
#5    0x0000000103228174 in ::-[WebHTMLView flagsChanged:](NSEvent *) at /Projects/Safari/OpenSource/Source/WebKit/mac/WebView/WebHTMLView.mm:5300

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