Fix the random crash at the startup on Macos&&Linux

don't do the post_init when adding script handler of webview

Change-Id: I2c766c46bb67347286765dee539657b5efd7f64a

src/slic3r/GUI/GUI_App.cpp

@@ -2307,7 +2307,7 @@ bool GUI_App::on_init_inner()
 //#ifdef __linux__
 //        if (!m_post_initialized && m_opengl_initialized) {
 //#else
-        if (!m_post_initialized) {
+        if (!m_post_initialized && !m_adding_script_handler) {
 //#endif
             m_post_initialized = true;
 #ifdef WIN32

src/slic3r/GUI/GUI_App.hpp

@@ -269,6 +269,8 @@ private:
     boost::thread    m_sync_update_thread;
     bool             enable_sync = false;
 
+    bool             m_adding_script_handler { false };
+
 public:
     bool            OnInit() override;
     bool            initialized() const { return m_initialized; }
@@ -458,6 +460,8 @@ public:
     //BBS
     void            load_url(wxString url);
     void run_script(wxString js);
+    bool            is_adding_script_handler() { return m_adding_script_handler; }
+    void            set_adding_script_handler(bool status) { m_adding_script_handler = status; }
 
     // Parameters extracted from the command line to be passed to GUI after initialization.
     GUI_InitParams* init_params { nullptr };

src/slic3r/GUI/Widgets/WebView.cpp

@@ -107,8 +107,12 @@ wxWebView* WebView::CreateWebView(wxWindow * parent, wxString const & url)
 #ifndef __WIN32__
         Slic3r::GUI::wxGetApp().CallAfter([webView] {
 #endif
+        BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ": begin to add script message handler for wx.";
+        Slic3r::GUI::wxGetApp().set_adding_script_handler(true);
         if (!webView->AddScriptMessageHandler("wx"))
             wxLogError("Could not add script message handler");
+        Slic3r::GUI::wxGetApp().set_adding_script_handler(false);
+        BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ": finished add script message handler for wx.";
 #ifndef __WIN32__
         });
 #endif