Web Inspector: Inspector fails to open when inspecting iOS devices

Created attachment 204724 [details]
Screen shot of "localized string not found" window

Using the latest nightly, Web Inspector doesn't open when trying to inspect pages either in Safari or in a UIWebView (phonegap) on iOS Simulator (6.1) or on iPhone 4S (6.1). The last working nightly is r151446. Sometimes, if you try to inspect the same target multiple times, on the second and subsequent attempts, the console displays the following:

Jun 14 11:21:24 bjdesktop.local SafariForWebKitDevelopment[8110]: WebKit r151595 initialized.
Jun 14 11:21:36 bjdesktop.local SafariForWebKitDevelopment[8110]: An uncaught exception was raised
Jun 14 11:21:36 bjdesktop.local SafariForWebKitDevelopment[8110]: *** -[NSPlaceholderString initWithFormat:locale:arguments:]: nil argument
Jun 14 11:21:36 bjdesktop.local SafariForWebKitDevelopment[8110]: (
		0   CoreFoundation                      0x00007fff842700a6 __exceptionPreprocess + 198
		1   libobjc.A.dylib                     0x00007fff8d4343f0 objc_exception_throw + 43
		2   CoreFoundation                      0x00007fff8426fe7c +[NSException raise:format:] + 204
		3   Foundation                          0x00007fff8e5f806a -[NSPlaceholderString initWithFormat:locale:arguments:] + 100
		4   Foundation                          0x00007fff8e5f91bc +[NSString stringWithFormat:] + 170
		5   WebInspector                        0x0000000110e082ad -[RWIInspectorWindowController updateWindowTitleWithURLComponents:] + 210
		6   WebInspector                        0x0000000110e0854c -[RWIInspectorWindowController showWindow:] + 283
		7   WebInspector                        0x0000000110e098be -[RWIManager openInspectorForWebView:] + 226
		8   AppKit                              0x00007fff89b9ba59 -[NSApplication sendAction:to:from:] + 342
		9   Safari                              0x000000010c5ebc76 -[BrowserApplication sendAction:to:from:] + 54
		10  AppKit                              0x00007fff89cd144c -[NSMenuItem _corePerformAction] + 406
		11  AppKit                              0x00007fff89cd113a -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 133
		12  AppKit                              0x00007fff899be46f -[NSMenu _internalPerformActionForItemAtIndex:] + 36
		13  AppKit                              0x00007fff899be2f7 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 135
		14  AppKit                              0x00007fff89cca245 NSSLMMenuEventHandler + 342
		15  HIToolbox                           0x00007fff8a91ff0a _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1206
		16  HIToolbox                           0x00007fff8a91f3d9 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 410
		17  HIToolbox                           0x00007fff8a9351bd SendEventToEventTarget + 40
		18  HIToolbox                           0x00007fff8a96be89 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueEventRef + 443
		19  HIToolbox                           0x00007fff8a910c11 SendMenuCommandWithContextAndModifiers + 59
		20  HIToolbox                           0x00007fff8a910bc3 SendMenuItemSelectedEvent + 254
		21  HIToolbox                           0x00007fff8a910a4f _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 94
		22  HIToolbox                           0x00007fff8a8ecaab _ZL14MenuSelectCoreP8MenuData5PointdjPP13OpaqueMenuRefPt + 605
		23  HIToolbox                           0x00007fff8a8ec0b8 _HandleMenuSelection2 + 565
		24  AppKit                              0x00007fff89b899c6 _NSHandleCarbonMenuEvent + 245
		25  AppKit                              0x00007fff89aabb7f _DPSNextEvent + 2073
		26  AppKit                              0x00007fff89aaaed2 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
		27  Safari                              0x000000010c5ec75b -[BrowserApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 162
		28  AppKit                              0x00007fff89aa2283 -[NSApplication run] + 517
		29  AppKit                              0x00007fff89a46cb6 NSApplicationMain + 869
		30  Safari                              0x000000010c7bfd54 SafariMain + 166
		31  libdyld.dylib                       0x00007fff840407e1 start + 0
		32  ???                                 0x0000000000000003 0x0 + 3
	)
 

If you attempt to attach a remote page several times, and then you open the web inspector on a local page, close it, and then open a remote page again, you will sometimes get an inspector window with no panels (just a grey box, see attachment) with the title "localized string not found" with no messages in the console.

Steps to replicate:
1. Open iOS Simulator and browse to www.google.com in Safari
2. Open WebKit
3. Select Develop -> iPhone Simulator -> www.google.com
4. Repeat 3 several times and you may get the console message.
5. Select Develop -> Show Web Inspector (on another open window, e.g. the WebKit Nightly page)
6. Close Web Inspector
7. Repeat 3 several times and you may get the "localized string not found" window.

[Radar WebKit Bug Importer]

<rdar://problem/14158727>

[Joseph Pecoraro]

Thanks for reporting! This should be fixed in the next nightly or so. We've made fix in the closed source framework.