Stop abusing private APIs for "Inspect Element" menu item

 When WebKit2 first announced, there was no way for an
 app to take an NSMenu, modify it, and return the result
 when a context menu is presented.

 WebKit1 had a delegate method for that named:
 -webView:contextMenuItemsForElement:defaultMenuItems:

 WebKit2 added this delegate method, in private, but it
 was not available until the next update of macOS.

 'Til then, we had to fake "Inspect Element" because we
 did not have access to the default implementation that
 is available through the delegate method.

 Apple now flags the function names that were used to do that.

 This will break "Inspect Element" on one version of macOS.
 Which one I don't even recall.
 But it is worth it to make the review process smoother.

Sources/App/Classes/Controllers/TXMenuController.m

@@ -1401,16 +1401,35 @@ - (void)copyLogAsHtml:(id)sender
 
 - (void)openWebInspector:(id)sender
 {
-	TVCLogView *webView = self.selectedViewControllerBackingView;
+	/*
+	 When WebKit2 first announced, there was no way for an
+	 app to take an NSMenu, modify it, and return the result
+	 when a context menu is presented.
 
-	if (webView == nil) {
-		return;
-	}
+	 WebKit1 had a delegate method for that named:
+	 -webView:contextMenuItemsForElement:defaultMenuItems:
+
+	 WebKit2 added this delegate method, in private, but it
+	 was not available until the next update of macOS.
+
+	 'Til then, we had to fake "Inspect Element" because we
+	 did not have access to the default implementation that
+	 is available through the delegate method.
+
+	 Apple now flags the function names that were used to do that.
+
+	 This will break "Inspect Element" on one version of macOS.
+	 Which one I don't even recall.
+	 But it is worth it to make the review process smoother.
 
-	NSAssert(webView.isUsingWebKit2,
-		@"Missing implementation");
+	 Sorry.
+*/
 
-	[(TVCLogViewInternalWK2 *)webView.webView openWebInspector];
+	(void)
+	[TDCAlert alertWithMessage:TXTLS(@"Prompts[kig-m1]")
+						 title:TXTLS(@"Prompts[ujw-64]")
+				 defaultButton:TXTLS(@"Prompts[c7s-dq]")
+			   alternateButton:nil];
 }
 
 - (void)markScrollback:(id)sender

Sources/App/Classes/Headers/Private/TVCLogViewInternalWK2.h

@@ -54,8 +54,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 + (void)emptyCaches;
 + (void)emptyCaches:(void (^ _Nullable)(void))completionHandler;
-
-- (void)openWebInspector;
 @end
 
 NS_ASSUME_NONNULL_END

Sources/App/Classes/Views/Channel View/TVCLogViewInternalWK2.m

@@ -305,27 +305,6 @@ + (void)emptyCaches:(void (^ _Nullable)(void))completionHandler
 	}
 }
 
-- (void)openWebInspector
-{
-	WKPageRef pageRef = NULL;
-
-	if (TEXTUAL_RUNNING_ON_SIERRA) {
-		pageRef = [self _pageForTesting];
-	} else if (TEXTUAL_RUNNING_ON_ELCAPITAN) {
-		WKView *webViewParent = (id)self.subviews[0];
-
-		pageRef = [webViewParent pageRef];
-	}
-
-	if (pageRef == NULL) {
-		return;
-	}
-
-	WKInspectorRef inspectorRef = WKPageGetInspector(pageRef);
-
-	WKInspectorShow(inspectorRef);
-}
-
 - (void)findString:(NSString *)searchString movingForward:(BOOL)movingForward
 {
 	NSParameterAssert(searchString != nil);

Sources/App/Resources/Language Files/en.lproj/Prompts.strings

@@ -160,3 +160,6 @@
 
 "rn7-08" = "Unable to access iCloud";
 "wjn-f1" = "Make sure you're logged in and that “iCloud Drive” or “Documents & Data” is enabled.";
+
+"ujw-64" = "The “Inspect Element” feature of WebKit2 cannot be accessed on this version of macOS.";
+"kig-m1" = "Disable WebKit2 or upgrade to a newer version of macOS.";