1. Create a new presentation, add a "Title, text" slide.
2. Set "Title" as Title, "This text should not disappear" as Text.
3. Right click on the Text, Text... -> Text Animation -> Effect: Scroll Through,
   Direction: Right, check "Text visible when exiting", Animation cycles: 1,
   Pixels: 6 pixels
4. Slide Show -> Slide Show

Expected: The text does not disappear from the screen.

Actual: Most of the text is invisible after the animation, only the first few
letters are visible, regardless that "Text visible when exiting" is checked or not.

[Reported by Elio Marchetti during Italian QA tests]