Fixed possible access violation in Lazarus_Linux_QT6/SimpleBrowser

Author: salvadordf

demos/Lazarus_Linux_QT6/SimpleBrowser/umainform.pas

@@ -174,7 +174,7 @@ procedure TMainForm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
       FClosing := True;
       Visible  := False;
       Chromium1.CloseBrowser(True);
-      CEFLinkedWindowParent1.Free;
+      FreeAndNil(CEFLinkedWindowParent1);
     end;
 end;
 {%Endregion}
@@ -219,7 +219,8 @@ procedure TMainForm.BrowserCloseFormMsg(Data: PtrInt);
 
 procedure TMainForm.BrowserSetFocusMsg(Data: PtrInt);
 begin
-  CEFLinkedWindowParent1.SetFocus;
+  if assigned(CEFLinkedWindowParent1) then
+    CEFLinkedWindowParent1.SetFocus;
 end;
 
 procedure TMainForm.WMMove(var Message: TLMMove);

update_CEF4Delphi.json

@@ -2,7 +2,7 @@
   "UpdateLazPackages" : [
     {
       "ForceNotify" : true,
-      "InternalVersion" : 799,
+      "InternalVersion" : 800,
       "Name" : "cef4delphi_lazarus.lpk",
       "Version" : "140.1.14"
     }