Keep symbol synced with edit tool

Undo/Redo can change the symbol referenced by the symbol drawing tool.
This updates the current symbol before important steps to keep the
system synced

Fixes https://gitlab.com/kicad/code/kicad/issues/10125

(cherry picked from commit b8a7a66a0a)

eeschema/symbol_editor/symbol_editor.cpp

@@ -385,6 +385,8 @@ bool SYMBOL_EDIT_FRAME::LoadOneLibrarySymbolAux( LIB_SYMBOL* aEntry, const wxStr
     RebuildSymbolUnitsList();
     SetShowDeMorgan( GetCurSymbol()->HasConversion() );
 
+    ClearUndoRedoList();
+
     // Display the document information based on the entry selected just in
     // case the entry is an alias.
     UpdateMsgPanel();

eeschema/tools/symbol_editor_drawing_tools.cpp

@@ -343,6 +343,9 @@ int SYMBOL_EDITOR_DRAWING_TOOLS::DrawShape( const TOOL_EVENT& aEvent )
         }
         else if( evt->IsClick( BUT_LEFT ) && !item )
         {
+            // Update in case the symbol was changed while the tool was running
+            symbol = m_frame->GetCurSymbol();
+
             if( !symbol )
                 continue;
 
@@ -365,6 +368,12 @@ int SYMBOL_EDITOR_DRAWING_TOOLS::DrawShape( const TOOL_EVENT& aEvent )
         else if( item && ( evt->IsClick( BUT_LEFT ) || evt->IsDblClick( BUT_LEFT )
                         || evt->IsAction( &EE_ACTIONS::finishDrawing ) ) )
         {
+            if( symbol != m_frame->GetCurSymbol() )
+            {
+                symbol = m_frame->GetCurSymbol();
+                item->SetParent( symbol );
+            }
+
             if( evt->IsDblClick( BUT_LEFT ) || evt->IsAction( &EE_ACTIONS::finishDrawing )
                     || !item->ContinueEdit( wxPoint( cursorPos.x, -cursorPos.y ) ) )
             {