Provide lazy loading of webview panel

Avoid instantiating the panel prior to it being shown (if at all)

eeschema/sch_edit_frame.cpp

@@ -368,7 +368,9 @@ SCH_EDIT_FRAME::SCH_EDIT_FRAME( KIWAY* aKiway, wxWindow* aParent ) :
         SetAuiPaneSize( m_auimgr, designBlocksPane, aui_cfg.design_blocks_panel_docked_width, -1 );
 
     if( aui_cfg.remote_symbol_show )
+    {
         SetAuiPaneSize( m_auimgr, remoteSymbolPane, aui_cfg.remote_symbol_panel_docked_width, -1 );
+    }
 
     if( aui_cfg.hierarchy_panel_docked_width > 0 )
     {
@@ -412,6 +414,14 @@ SCH_EDIT_FRAME::SCH_EDIT_FRAME( KIWAY* aKiway, wxWindow* aParent ) :
         m_auimgr.Update();
     }
 
+    CallAfter( [this]()
+            {
+                wxAuiPaneInfo& remotePane = m_auimgr.GetPane( RemoteSymbolPaneName() );
+
+                if( remotePane.IsShown() && m_remoteSymbolPane )
+                    m_remoteSymbolPane->Activate();
+            } );
+
     resolveCanvasType();
     SwitchCanvas( m_canvasType );
 
@@ -2954,6 +2964,9 @@ void SCH_EDIT_FRAME::ToggleRemoteSymbolPanel()
 
     if( remotePane.IsShown() )
     {
+        if( m_remoteSymbolPane )
+            m_remoteSymbolPane->Activate();
+
         if( remotePane.IsFloating() )
         {
             remotePane.FloatingSize( cfg->m_AuiPanels.remote_symbol_panel_float_width,

eeschema/widgets/panel_remote_symbol.cpp

@@ -258,21 +258,6 @@ PANEL_REMOTE_SYMBOL::PANEL_REMOTE_SYMBOL( SCH_EDIT_FRAME* aParent ) :
     controlsSizer->Add( m_configButton, 0, wxALIGN_CENTER_VERTICAL );
 
     topSizer->Add( controlsSizer, 0, wxEXPAND | wxALL, FromDIP( 4 ) );
-
-    m_webView = new WEBVIEW_PANEL( this );
-    m_webView->AddMessageHandler( wxS( "kicad" ),
-                                  [this]( const wxString& aPayload )
-                                  {
-                                      onKicadMessage( aPayload );
-                                  } );
-    m_webView->SetHandleExternalLinks( true );
-    m_webView->BindLoadedEvent();
-
-    if( wxWebView* browser = m_webView->GetWebView() )
-        browser->Bind( wxEVT_WEBVIEW_LOADED, &PANEL_REMOTE_SYMBOL::onWebViewLoaded, this );
-
-    topSizer->Add( m_webView, 1, wxEXPAND | wxLEFT | wxRIGHT | wxBOTTOM, FromDIP( 2 ) );
-
     SetSizer( topSizer );
 
     m_dataSourceChoice->Bind( wxEVT_CHOICE, &PANEL_REMOTE_SYMBOL::onDataSourceChanged, this );
@@ -292,6 +277,35 @@ PANEL_REMOTE_SYMBOL::~PANEL_REMOTE_SYMBOL()
 }
 
 
+void PANEL_REMOTE_SYMBOL::Activate()
+{
+    ensureWebView();
+    RefreshDataSources();
+}
+
+
+void PANEL_REMOTE_SYMBOL::ensureWebView()
+{
+    if( m_webView )
+        return;
+
+    m_webView = new WEBVIEW_PANEL( this );
+    m_webView->AddMessageHandler( wxS( "kicad" ),
+                                  [this]( const wxString& aPayload )
+                                  {
+                                      onKicadMessage( aPayload );
+                                  } );
+    m_webView->SetHandleExternalLinks( true );
+    m_webView->BindLoadedEvent();
+
+    if( wxWebView* browser = m_webView->GetWebView() )
+        browser->Bind( wxEVT_WEBVIEW_LOADED, &PANEL_REMOTE_SYMBOL::onWebViewLoaded, this );
+
+    GetSizer()->Add( m_webView, 1, wxEXPAND | wxLEFT | wxRIGHT | wxBOTTOM, FromDIP( 2 ) );
+    Layout();
+}
+
+
 void PANEL_REMOTE_SYMBOL::BindWebViewLoaded()
 {
     if( wxWebView* browser = m_webView ? m_webView->GetWebView() : nullptr )
@@ -376,7 +390,10 @@ void PANEL_REMOTE_SYMBOL::RefreshDataSources()
     if( m_providerEntries.empty() )
     {
         m_dataSourceChoice->Enable( false );
-        showMessage( _( "No remote providers configured." ) );
+
+        if( m_webView )
+            showMessage( _( "No remote providers configured." ) );
+
         return;
     }
 
@@ -397,7 +414,9 @@ void PANEL_REMOTE_SYMBOL::RefreshDataSources()
     }
 
     m_dataSourceChoice->SetSelection( selected );
-    loadProvider( selected );
+
+    if( m_webView )
+        loadProvider( selected );
 }
 
 

eeschema/widgets/panel_remote_symbol.h

@@ -56,6 +56,7 @@ public:
     explicit PANEL_REMOTE_SYMBOL( SCH_EDIT_FRAME* aParent );
     ~PANEL_REMOTE_SYMBOL() override;
 
+    void Activate();
     void RefreshDataSources();
     bool HasDataSources() const { return !m_providerEntries.empty(); }
     void BindWebViewLoaded();
@@ -63,6 +64,7 @@ public:
     void LoadCookies();
 
 private:
+    void ensureWebView();
     void onDataSourceChanged( wxCommandEvent& aEvent );
     void onConfigure( wxCommandEvent& aEvent );
     void onRefresh( wxCommandEvent& aEvent );