(This is actually based on the preview mode since issue 45488 prevents me from
viewing the effect in Presentation mode).

1. Select a long line (an item spanning several lines) in Impress
2. Format->Text->Text Animation, set to "Scroll through"
3. Text wrapping is ignored and the text is rendered on one long scrolling line;
   when animation stops you thus see only a portion of the original item.

Expected result: the whole item text is always shown somehow, and at the end of
the animation the whole item text is visible.

[Reported by ALex during Italian QA tests]