Custom context menu items (Remove / Save As / Inspect)

Example:

if (!m_displayPageUrlContextSubMenuItem)
{
	items->RemoveValueAtIndex(0); // Back
	itemsCount--;
	items->RemoveValueAtIndex(0); // Forward
	itemsCount--;
	items->RemoveValueAtIndex(5); // Share
	itemsCount--;
	items->RemoveValueAtIndex(5); // Separator
	itemsCount--;
}

Looks like:

Questions:

1. Is the default menu always going to be the same? I am concerned about using the literal index positions. If the default menu changes my code then breaks. What is the best approach?
2. Save As does nothing in my application. Why?
3. Can we change Inspect (which works) to Inspect Element?
4. How can we add new functional menu item for View Page Source?

AB#39691823

The issue names no repository file, test, or implementation entry point. Start by tracing the WebView2 custom context-menu behavior described in the example, then verify the default item identification, Save As behavior, Inspect naming, and View Page Source support; done means each question has a documented, supported answer.