Description

JupyterLab-Deck sounds very promising.

However, coming from rise / reveal, I am used to space (resp. shift-space) to move through the whole
slide show by minimal step; e.g. move to the next (resp. previous) available fragment/subslide/slide.
However, in certain situations, space skips subslides. And in certain situations, shift-space skips
fragments and subslides. In particular, space and shift-space are not reverse operations.

Is this on purpose or a bug?

Thanks!

Reproduce

1. Launch the jupyterlab-deck, e.g. from the jupyterlite demo.

2. Upload the attached
   test.ipynb.zip (sorry, zipped, because github does not support ipynb attachments ...)

3. Open test.ipynb notebook

4. Toggle Deck
   The (first fragment of the) first slide is displayed

5. Hit space
   The following fragment is displayed

6. Hit space
   Expected: the following subslide "Subslide1" is displayed
   Got: the subslide "subslide2" is displayed

7. Hit space until reaching Slide2

8. Hit shift-space
   Expected: Subslide2 and its fragment is displayed
   Got: Slide 1 is displayed

Context

• Browser: Firefox 117

No message in the browser console, except for standard GET calls to kernels/sessions/...