On-the-fly translations for Grid and Zoom menus.

Fixes https://gitlab.com/kicad/code/kicad/issues/10961

(cherry picked from commit 107067ad05)

common/tool/conditional_menu.cpp

@@ -144,20 +144,21 @@ void CONDITIONAL_MENU::Evaluate( SELECTION& aSelection )
         switch( entry.Type() )
         {
             case ENTRY::ACTION:
-                menuItem = Add( *entry.Action(), entry.IsCheckmarkEntry() );
+                Add( *entry.Action(), entry.IsCheckmarkEntry() );
                 menu_count++;
                 break;
 
             case ENTRY::MENU:
-                menuItem = Add( entry.Menu() );
+                entry.Menu()->UpdateTitle();
+                Add( entry.Menu() );
                 menu_count++;
                 break;
 
             case ENTRY::WXITEM:
                 menuItem = new wxMenuItem( this,
                                            entry.wxItem()->GetId(),
-                                           entry.wxItem()->GetItemLabel(),
-                                           entry.wxItem()->GetHelp(),
+                                           wxGetTranslation( entry.wxItem()->GetItemLabel() ),
+                                           wxGetTranslation( entry.wxItem()->GetHelp() ),
                                            entry.wxItem()->GetKind() );
 
                 if( !!entry.GetIcon() )
@@ -171,7 +172,7 @@ void CONDITIONAL_MENU::Evaluate( SELECTION& aSelection )
 
             case ENTRY::SEPARATOR:
                 if( menu_count )
-                    menuItem = AppendSeparator();
+                    AppendSeparator();
 
                 menu_count = 0;
                 break;

common/tool/grid_menu.cpp

@@ -37,7 +37,7 @@ GRID_MENU::GRID_MENU( EDA_DRAW_FRAME* aParent ) :
         ACTION_MENU( true ),
         m_parent( aParent )
 {
-    SetTitle( _( "Grid" ) );
+    UpdateTitle();
     SetIcon( BITMAPS::grid_select );
 
     APP_SETTINGS_BASE* settings = m_parent->config();
@@ -59,6 +59,12 @@ OPT_TOOL_EVENT GRID_MENU::eventHandler( const wxMenuEvent& aEvent )
 }
 
 
+void GRID_MENU::UpdateTitle()
+{
+    SetTitle( _( "Grid" ) );
+}
+
+
 void GRID_MENU::update()
 {
     APP_SETTINGS_BASE* settings = m_parent->config();

common/tool/zoom_menu.cpp

@@ -40,13 +40,8 @@ ZOOM_MENU::ZOOM_MENU( EDA_DRAW_FRAME* aParent ) :
         ACTION_MENU( true ),
         m_parent( aParent )
 {
-    SetTitle( _( "Zoom" ) );
+    UpdateTitle();
     SetIcon( BITMAPS::zoom_selection );
-
-    int i = ID_POPUP_ZOOM_LEVEL_START + 1;  // 0 reserved for menus which support auto-zoom
-
-    for( double factor : m_parent->config()->m_Window.zoom_factors )
-        Append( i++, wxString::Format( _( "Zoom: %.2f" ), factor ), wxEmptyString, wxITEM_CHECK );
 }
 
 
@@ -58,17 +53,30 @@ OPT_TOOL_EVENT ZOOM_MENU::eventHandler( const wxMenuEvent& aEvent )
 }
 
 
+void ZOOM_MENU::UpdateTitle()
+{
+    SetTitle( _( "Zoom" ) );
+}
+
+
 void ZOOM_MENU::update()
 {
+    Clear();
+
+    int ii = ID_POPUP_ZOOM_LEVEL_START + 1;  // 0 reserved for menus which support auto-zoom
+
+    for( double factor : m_parent->config()->m_Window.zoom_factors )
+        Append( ii++, wxString::Format( _( "Zoom: %.2f" ), factor ), wxEmptyString, wxITEM_CHECK );
+
     double zoom = m_parent->GetCanvas()->GetGAL()->GetZoomFactor();
 
     const std::vector<double>& zoomList = m_parent->config()->m_Window.zoom_factors;
 
-    for( size_t i = 0; i < zoomList.size(); ++i )
+    for( size_t jj = 0; jj < zoomList.size(); ++jj )
     {
         // Search for a value near the current zoom setting:
-        double rel_error = std::fabs( zoomList[i] - zoom ) / zoom;
+        double rel_error = std::fabs( zoomList[jj] - zoom ) / zoom;
         // IDs start with 1 (leaving 0 for auto-zoom)
-        Check( ID_POPUP_ZOOM_LEVEL_START + i + 1, rel_error < 0.1 );
+        Check( ID_POPUP_ZOOM_LEVEL_START + jj + 1, rel_error < 0.1 );
     }
 }

include/tool/action_menu.h

@@ -156,6 +156,11 @@ public:
      */
     void UpdateAll();
 
+    /**
+     * Used by some menus to just-in-time translate their titles.
+     */
+    virtual void UpdateTitle() {}
+
     /**
      * Clear the dirty flag on the menu and all descendants.
      */

include/tool/grid_menu.h

@@ -35,6 +35,8 @@ class GRID_MENU : public ACTION_MENU
 public:
     GRID_MENU( EDA_DRAW_FRAME* aParent );
 
+    void UpdateTitle() override;
+
     static void BuildChoiceList( wxArrayString* aGridsList, APP_SETTINGS_BASE* aCfg,
                                  EDA_DRAW_FRAME* aParent );
 

include/tool/zoom_menu.h

@@ -34,6 +34,8 @@ class ZOOM_MENU : public ACTION_MENU
 public:
     ZOOM_MENU( EDA_DRAW_FRAME* aParent );
 
+    void UpdateTitle() override;
+
 private:
     ACTION_MENU* create() const override
     {