Handle WebKitWebView create-web-view.

In some cases a new window is signalled using create-web-view rather than new-window-policy-decision-requested and so we need to handle it to emit the correct new window events.

Fixes #15447.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74804 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/webview_webkit.h

@@ -130,6 +130,9 @@ public:
     //We use this flag to stop recursion when we load a page from the navigation
     //callback, mainly when loading a VFS page
     bool m_guard;
+    //This flag is use to indicate when a navigation event is the result of a
+    //create-web-view signal and so we need to send a new window event
+    bool m_creating;
 
 protected:
     virtual void DoSetPage(const wxString& html, const wxString& baseUrl);