Problem:
When copying a slide from one presentation to a new presentation, the "After" setting in "Transition" tab becomes enabled.
Before copying slide the "After" setting is disabled
After using spire.presentation to generate new pptx:
To reproduce the problem:
1. Use the Template below:
2. copy the 1st slide into a new presentation
3. save as Pptx2010
4. Open pptx and check if the `After` setting is enabled or not.
Expected result: `After` should not be enabled because it was not enabled in the template.