Slides that exceed display size will scroll remaining distance

[burtlo]

Sometimes you create slides that are larger than the display area. It would be ideal to have the slide render as normal but allow for the overflow to be scrolled up to be displayed.

Given a slide with content that exceeds the display area by half a slide
When the presenter presses to advance the slide
Then I expect the slide content to scroll up an entire slide length
When the presenter presses to advance the slide
Then I expect the presentation to move to the next slide

Given a slide with content that exceeds the display area by two slides
When the presenter presses to advance the slide
Then I expect the slide content to scroll up an entire slide length
When the presenter presses to advance the slide
Then I expect the slide content to scroll up an entire slide length
When the presenter presses to advance the slide
Then I expect the presentation to move to the next slide