Make nbtutor play nice with RISE live show mode

[Naereen]

This extension works very well for me, and I'm a big fan and intense user of the RISE jupyter extension to teach with Jupyter notebook being displayed in full screen as slides.

As shown in this demo:

using nbtutor from the RISE live show mode (regardless of being full-screen) works from the backend side, but not from the frontend UI side: the control buttons are hidden!
But exiting the RISE mode shows that the buttons are there, they work and everything is fine.

This issue is here to notify about this bug, and I can try to help, but I'm not an expert on the architecture of nbtutor, so I would need your help @lgpage!
Thanks in advance!

[Naereen]

By a quick exploration of my browser developper tool, I suspect that from the RISE part, this class is in charge of making the cell toolbar disappear: .rise-enabled .celltoolbar.

So when importing nbtutor, it should be possible to revert all the CSS rules that RISE declares to hide the celltoolbar...

But from what I see here (latest version):
https://github.com/damianavila/RISE/blob/ed64f2fe81b7d26ee34c96f4dfdfbf74cdae7fb7/classic/src/less/main.less#L115
the .rise-enabled .celltoolbar class is not declared to be hidden... so 🤔 puzzling, it is!

[Naereen]

So, I found what to change on RISE css, just delete or disable this rule!

.rise-enabled.ctb_global_show .ctb_hideshow.ctb_show {
    display: none;
}

So it's this line:
https://github.com/damianavila/RISE/blob/ed64f2fe81b7d26ee34c96f4dfdfbf74cdae7fb7/classic/src/less/main.less#L111

.rise-enabled {
  [...]
  &.ctb_global_show {
    .ctb_hideshow.ctb_show { display: none; }
    .ctb_show ~ .text_cell_render { border-style: none; }
  }

[Naereen]

I guess the easiest way to go, if someone encounters the same issue, is to use Stylus

And this CSS userstyle:

@-moz-document regexp("https?://localhost:[0-9]*/notebooks/.*#/slide.*") {
/* New CSS style to show Jupyter celltoolbar when RISE live show mode is enabled.
 * See https://github.com/lgpage/nbtutor/issues/42
 * Released under the term of the MIT Licence (https://lbesson.mit-license.org/)
 * By Lilian Besson, © 2021
 * To use with Stylus, see https://userstyles.org
**/
.rise-enabled.ctb_global_show .ctb_hideshow.ctb_show {
    display: inherit !important;
}
}

source

[Naereen]

Opened damianavila/RISE#587 also, just to notify the users and authors of RISE, just in case!