Styles filtered when pasting a text without checking filter styles

Steps to reproduce:
1. Create a new page
2. Copy some pre formatted text from web
3. Click on the Paste button from WYSIWYG menu
4. Paste the copied content in the required area
5. Uncheck the box "Filter Styles"
6. Click Import

Expected results:
1. The style for the text should not be removed when the box "Filter Style" is unchecked.