Don't rely on dynamic_cast across DLLs

See https://gitlab.com/kicad/code/kicad/-/issues/16998


(cherry picked from commit e9456201a7)

common/pgm_base.cpp

@@ -134,6 +134,7 @@ PGM_BASE::PGM_BASE()
     m_argcUtf8 = 0;
     m_argvUtf8 = nullptr;
     m_splash = nullptr;
+    m_PropertyGridInitialized = false;
 
     setLanguageId( wxLANGUAGE_DEFAULT );
 

common/widgets/properties_panel.cpp

@@ -24,6 +24,7 @@
 #include <eda_base_frame.h>
 #include <eda_item.h>
 #include <import_export.h>
+#include <pgm_base.h>
 #include <properties/pg_cell_renderer.h>
 
 #include <algorithm>
@@ -65,10 +66,11 @@ PROPERTIES_PANEL::PROPERTIES_PANEL( wxWindow* aParent, EDA_BASE_FRAME* aFrame )
         wxPGEditor_DatePickerCtrl = nullptr;
     }
 
-    if( !dynamic_cast<PG_CELL_RENDERER*>( wxPGGlobalVars->m_defaultRenderer ) )
+    if( !Pgm().m_PropertyGridInitialized )
     {
         delete wxPGGlobalVars->m_defaultRenderer;
         wxPGGlobalVars->m_defaultRenderer = new PG_CELL_RENDERER();
+        Pgm().m_PropertyGridInitialized = true;
     }
 
     m_caption = new wxStaticText( this, wxID_ANY, _( "No objects selected" ) );

include/pgm_base.h

@@ -377,6 +377,8 @@ public:
 
     bool m_Quitting;
 
+    bool m_PropertyGridInitialized;
+
 protected:
     /// Loads internal settings from COMMON_SETTINGS
     void loadCommonSettings();