Prevent events from firing in the main window during load

Closing the source window while another wx loop is running can lead to
async events being processed, leaving the current stack out of scope

Fixes https://gitlab.com/kicad/code/kicad/-/issues/19341

eeschema/sch_edit_frame.cpp

@@ -1195,6 +1195,7 @@ void SCH_EDIT_FRAME::OnUpdatePCB()
     }
 
     KIWAY_PLAYER* frame = Kiway().Player( FRAME_PCB_EDITOR, false );
+    wxEventBlocker blocker( this );
 
     if( !frame )
     {
@@ -1425,6 +1426,7 @@ void SCH_EDIT_FRAME::OnOpenPcbnew()
         }
         else
         {
+            wxEventBlocker blocker(this);
             KIWAY_PLAYER* frame = Kiway().Player( FRAME_PCB_EDITOR, false );
 
             if( !frame )

kicad/dialogs/panel_jobs.cpp

@@ -712,6 +712,9 @@ void PANEL_JOBS::EnsurePcbSchFramesOpen()
         wxFileName boardfn = project.GetProjectFullName();
         boardfn.SetExt( FILEEXT::PcbFileExtension );
 
+        // Prevent our window from being closed during the open process
+        wxEventBlocker blocker( this );
+
         frame->OpenProjectFiles( std::vector<wxString>( 1, boardfn.GetFullPath() ) );
     }
 
@@ -729,6 +732,8 @@ void PANEL_JOBS::EnsurePcbSchFramesOpen()
         wxFileName schFn = project.GetProjectFullName();
         schFn.SetExt( FILEEXT::KiCadSchematicFileExtension );
 
+        wxEventBlocker blocker( this );
+
         frame->OpenProjectFiles( std::vector<wxString>( 1, schFn.GetFullPath() ) );
     }
 }

pcbnew/pcb_edit_frame.cpp

@@ -1315,7 +1315,7 @@ void PCB_EDIT_FRAME::ShowBoardSetupDialog( const wxString& aInitialPage )
 
     if( !aInitialPage.IsEmpty() )
         dlg.SetInitialPage( aInitialPage, wxEmptyString );
-        
+
     // Assign dlg to the m_boardSetupDlg pointer to track its status.
     m_boardSetupDlg = &dlg;
 
@@ -1950,6 +1950,7 @@ int PCB_EDIT_FRAME::TestStandalone()
 
     if( !frame->IsShownOnScreen() )
     {
+        wxEventBlocker blocker( this );
         wxFileName fn( Prj().GetProjectPath(), Prj().GetProjectName(),
                        FILEEXT::KiCadSchematicFileExtension );
 
@@ -2080,11 +2081,14 @@ void PCB_EDIT_FRAME::RunEeschema()
             }
             catch( const IO_ERROR& err )
             {
+
                 DisplayErrorMessage( this, _( "Eeschema failed to load." ) + wxS( "\n" ) + err.What() );
                 return;
             }
         }
 
+        wxEventBlocker blocker( this );
+
         // If Kiway() cannot create the eeschema frame, it shows a error message, and
         // frame is null
         if( !frame )