Add the same robust browser recreation for WebViewDialog

It should eliminate possible issue with blank Home and other pages
in the same way as Printer page

src/slic3r/GUI/PrinterWebView.cpp

@@ -183,7 +183,6 @@ void PrinterWebView::create_browser()
 
 void PrinterWebView::reset_browser()
 {
-    BOOST_LOG_TRIVIAL(info) << "DEVTAB reset_browser"; // TEMP diag
     wxSizer* topsizer = GetSizer();
     if (m_browser) {
         if (topsizer)

src/slic3r/GUI/Project.cpp

@@ -51,16 +51,12 @@ ProjectPanel::ProjectPanel(wxWindow *parent, wxWindowID id, const wxPoint &pos,
 
     wxBoxSizer* main_sizer = new wxBoxSizer(wxVERTICAL);
 
-    m_browser = WebView::CreateWebView(this, m_project_home_url);
-    if (m_browser == nullptr) {
-        BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format("load web view of project page failed");
+    create_browser();
+    if (m_browser == nullptr)
         return;
-    }
+    m_reset_on_show = wxGetApp().is_recreating_gui();
     //m_browser->Hide();
     main_sizer->Add(m_browser, wxSizerFlags().Expand().Proportion(1));
-    m_browser->Bind(wxEVT_WEBVIEW_NAVIGATED, &ProjectPanel::on_navigated, this);
-    m_browser->Bind(wxEVT_WEBVIEW_SCRIPT_MESSAGE_RECEIVED, &ProjectPanel::OnScriptMessage, this, m_browser->GetId());
-    Bind(wxEVT_WEBVIEW_NAVIGATING, &ProjectPanel::onWebNavigating, this, m_browser->GetId());
 
     Bind(EVT_PROJECT_RELOAD, &ProjectPanel::on_reload, this);
 
@@ -76,6 +72,36 @@ ProjectPanel::ProjectPanel(wxWindow *parent, wxWindowID id, const wxPoint &pos,
 
 ProjectPanel::~ProjectPanel() {}
 
+void ProjectPanel::create_browser()
+{
+    m_browser = WebView::CreateWebView(this, m_project_home_url);
+    if (m_browser == nullptr) {
+        BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format("load web view of project page failed");
+        return;
+    }
+    m_browser->Bind(wxEVT_WEBVIEW_NAVIGATED, &ProjectPanel::on_navigated, this);
+    m_browser->Bind(wxEVT_WEBVIEW_SCRIPT_MESSAGE_RECEIVED, &ProjectPanel::OnScriptMessage, this, m_browser->GetId());
+    Bind(wxEVT_WEBVIEW_NAVIGATING, &ProjectPanel::onWebNavigating, this, m_browser->GetId());
+}
+
+void ProjectPanel::reset_browser()
+{
+    wxSizer* sizer = GetSizer();
+    if (m_browser) {
+        if (sizer)
+            sizer->Detach(m_browser);
+        m_browser->Destroy();
+        m_browser = nullptr;
+    }
+    create_browser();
+    if (m_browser == nullptr)
+        return;
+    if (sizer) {
+        sizer->Insert(0, m_browser, wxSizerFlags().Expand().Proportion(1));
+        Layout();
+    }
+}
+
 // Helper to convert newlines to <br>
 static std::string convert_newlines_to_br(const std::string& text) {
     std::string result = text;
@@ -454,10 +480,16 @@ void ProjectPanel::RunScript(std::string content)
     WebView::RunScript(m_browser, content);
 }
 
-bool ProjectPanel::Show(bool show) 
+bool ProjectPanel::Show(bool show)
 {
+    // Recover from a wedged WebView2 backend created during a GUI rebuild by
+    // recreating the control the first time the panel is actually shown.
+    if (show && m_reset_on_show) {
+        m_reset_on_show = false;
+        reset_browser();
+    }
     if (show) update_model_data();
-    return wxPanel::Show(show); 
+    return wxPanel::Show(show);
 }
 
 }} // namespace Slic3r::GUI

src/slic3r/GUI/Project.hpp

@@ -68,8 +68,15 @@ private:
     wxString   m_project_home_url;
     wxString   m_root_dir;
     static inline int m_sequence_id = 8000;
+    // Set when this panel is built during a GUI rebuild (language switch), where
+    // the WebView2 backend can come up wedged. Recreate it on first show.
+    bool       m_reset_on_show = {false};
 
     void show_info_editor(bool show);
+    // Create/configure m_browser (create + bind events + load the home url).
+    void create_browser();
+    // Tear down and recreate m_browser to recover from a wedged backend.
+    void reset_browser();
     
 
 public:

src/slic3r/GUI/WebViewDialog.cpp

@@ -40,6 +40,7 @@ WebViewPanel::WebViewPanel(wxWindow *parent)
     wxString strlang = wxGetApp().current_language_code_safe();
     if (strlang != "")
         url = wxString::Format("file://%s/web/homepage/index.html?lang=%s", from_u8(resources_dir()), strlang);
+    m_home_url = url;
 
     wxBoxSizer* topsizer = new wxBoxSizer(wxVERTICAL);
     
@@ -83,12 +84,10 @@ WebViewPanel::WebViewPanel(wxWindow *parent)
     m_info = new wxInfoBar(this);
     topsizer->Add(m_info, wxSizerFlags().Expand());
     // Create the webview
-    m_browser = WebView::CreateWebView(this, url);
-    if (m_browser == nullptr) {
-        wxLogError("Could not init m_browser");
+    create_browser();
+    if (m_browser == nullptr)
         return;
-    }
-    m_browser->Hide();
+    m_reset_on_show = wxGetApp().is_recreating_gui();
     SetSizer(topsizer);
 
     topsizer->Add(m_browser, wxSizerFlags().Expand().Proportion(1));
@@ -237,6 +236,47 @@ WebViewPanel::~WebViewPanel()
 }
 
 
+void WebViewPanel::create_browser()
+{
+    m_browser = WebView::CreateWebView(this, m_home_url);
+    if (m_browser == nullptr) {
+        wxLogError("Could not init m_browser");
+        return;
+    }
+    m_browser->Hide();
+}
+
+void WebViewPanel::reset_browser()
+{
+    wxSizer* topsizer = GetSizer();
+    if (m_browser) {
+        if (topsizer)
+            topsizer->Detach(m_browser);
+        m_browser->Destroy();
+        m_browser = nullptr;
+    }
+    create_browser();
+    if (m_browser == nullptr)
+        return;
+    if (topsizer) {
+        topsizer->Add(m_browser, wxSizerFlags().Expand().Proportion(1));
+        Layout();
+    }
+}
+
+bool WebViewPanel::Show(bool show)
+{
+    // Recover from a wedged WebView2 backend created during a GUI rebuild by
+    // recreating the control the first time the Home tab is actually shown.
+    if (show && m_reset_on_show) {
+        m_reset_on_show = false;
+        reset_browser();
+        if (m_browser != nullptr)
+            m_browser->LoadURL(m_home_url);
+    }
+    return wxPanel::Show(show);
+}
+
 void WebViewPanel::load_url(wxString& url)
 {
     this->Show();

src/slic3r/GUI/WebViewDialog.hpp

@@ -105,9 +105,21 @@ public:
     int  get_model_mall_detail_url(std::string *url, std::string id);
 
     void update_mode();
+
+    bool Show(bool show = true) override;
 private:
+    // Create/configure m_browser (create the webview, hidden until loaded).
+    void create_browser();
+    // Tear down and recreate m_browser to recover from a wedged WebView2 backend
+    // after a GUI rebuild (language switch), then reload the home page.
+    void reset_browser();
 
     wxWebView* m_browser;
+    // Home page url (kept so the browser can be reloaded after a reset).
+    wxString m_home_url;
+    // Set when this panel is built during a GUI rebuild; recreate the backend on
+    // first show to recover from a wedged control.
+    bool m_reset_on_show{false};
     wxBoxSizer *bSizer_toolbar;
     wxButton *  m_button_back;
     wxButton *  m_button_forward;