[Ui\webview] Inspector not working properly on macOS

[drkameleon]

Describe the bug

When we open a webview with the .debug option (thus enabling the built-in Inspector) and try to see or use the Developer Tools, it behaves weirdly:

• There is a long error log in the terminal (= where we have loaded the script)
• The window itself seems "stuck" (it doesn't react normally, it doesn't seem to resize as it should, etc)
• If we open the Console tab, it actually gets stuck

To Reproduce

webview.debug {!html
    <h1>Hello through the webview</h1>
    <a href="#">Click here to see more!</a>
}

Save this as debugwebview.art and run with arturo mywebview.art.

And then right-click anywhere and select "Inspect Element".

The error log shows:

2024-09-24 06:47:11.482 arturo[27182:1587033] NSWindow warning: adding an unknown subview: <WKInspectorWKWebView: 0x7fb6fff15890>. Break on NSLog to debug.
2024-09-24 06:47:11.488 arturo[27182:1587033] Call stack:
(
	0   AppKit                              0x00007ff81de63e2a -[NSThemeFrame addSubview:] + 112
	1   AppKit                              0x00007ff81de63b69 -[NSView addSubview:positioned:relativeTo:] + 203
	2   AppKit                              0x00007ff81de63a26 -[NSThemeFrame addSubview:positioned:relativeTo:] + 46
	3   WebKit                              0x00007ff91dc81ce0 _ZN6WebKit19WebInspectorUIProxy14platformAttachEv + 336
	4   WebKit                              0x00007ff91de36878 _ZN6WebKit19WebInspectorUIProxy4openEv + 112
	5   WebKit                              0x00007ff91e07b97b _ZN6WebKit19WebInspectorUIProxy17didReceiveMessageERN3IPC10ConnectionERNS1_7DecoderE + 159
	6   WebKit                              0x00007ff91e1630ab _ZN3IPC18MessageReceiverMap15dispatchMessageERNS_10ConnectionERNS_7DecoderE + 203
	7   WebKit                              0x00007ff91dde98b3 _ZN6WebKit15WebProcessProxy17didReceiveMessageERN3IPC10ConnectionERNS1_7DecoderE + 31
	8   WebKit                              0x00007ff91e15f331 _ZN3IPC10Connection15dispatchMessageENSt3__110unique_ptrINS_7DecoderENS1_14default_deleteIS3_EEEE + 275
	9   WebKit                              0x00007ff91e15f76b _ZN3IPC10Connection24dispatchIncomingMessagesEv + 311
	10  JavaScriptCore                      0x00007ff835d95a9e _ZN3WTF7RunLoop11performWorkEv + 414
	11  JavaScriptCore                      0x00007ff835d9673a _ZN3WTF7RunLoop11performWorkEPv + 26
	12  CoreFoundation                      0x00007ff81ada1eba __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
	13  CoreFoundation                      0x00007ff81ada1e5c __CFRunLoopDoSource0 + 157
	14  CoreFoundation                      0x00007ff81ada1c35 __CFRunLoopDoSources0 + 217
	15  CoreFoundation                      0x00007ff81ada08bf __CFRunLoopRun + 916
	16  CoreFoundation                      0x00007ff81ad9fec1 CFRunLoopRunSpecific + 560
	17  HIToolbox                           0x00007ff824822f3d RunCurrentEventLoopInMode + 292
	18  HIToolbox                           0x00007ff824822d4e ReceiveNextEventCommon + 657
	19  HIToolbox                           0x00007ff824822aa8 _BlockUntilNextEventMatchingListInModeWithFilter + 64
	20  AppKit                              0x00007ff81de3e10c _DPSNextEvent + 858
	21  AppKit                              0x00007ff81de3cfb6 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1214
	22  AppKit                              0x00007ff81de2f638 -[NSApplication run] + 586
	23  arturo                              0x00000001035fcb3a _ZN7webview6detail22cocoa_wkwebview_engine8run_implEv + 74
	24  arturo                              0x00000001035fa1cd webview_run + 45
	25  arturo                              0x00000001038a56e6 show__helpersZwebviews_u295 + 22
	26  arturo                              0x0000000103940ff1 colonanonymous___libraryZ85i_u10136 + 2097
	27  arturo                              0x000000010376e912 ExecLoop__vmZexec_u233 + 11090
	28  arturo                              0x0000000103942d94 run + 692
	29  arturo                              0x0000000103949d7b NimMainModule + 1515
	30  arturo                              0x000000010394b3d1 main + 49
	31  dyld                                0x00007ff81a96c41f start + 1903
)

Screenshots

System

• OS: macOS
• Version: 13.6.4 (Ventura)

Additional context

Similar issue: webview/webview#1032