Original Summary: Impress Views Synchro mismatch with 2 windows on same document

In some cases, the left slide list displays a wrong slide selection.

Step by step buggy situation:
- create new Impress doc
- you are in view "Normal" (slide editing zone in center of screen) and View
"Slide" (slide list in left part of the screen)
- create a line on page 1
- create a new page, and create a rectangle on new page 2
- page 2 with rectangle is selected in left slide list and in edit zone 
- display a new Impress window on same document
- this 2nd Window displays slide 1 with line on each slide list and slide
editing zone
- 1st Window still displays slide 2 with rectangle on each slide list and slide
editing zone
- in this 1st Window, create a new circle object near Rectangle
--> Oops... slide list now selects slide 1 with line and editing zone still
displays slide 2 with rectange and circle !

This is quite disapointing on large documents.