Adding sub items to menu is confusing visually with all the + icons

[karmatosed]

If you add a few sub-items you get this visual:

I would suggest that seeing just one is better and this isn't a great experience for people, beyond the background not letting me see the '+' any way that well.

[mapk]

Ooooh. Those trailing + icons are all over the place! Definitely needs help.

Can we drop those + icons completely since we have a block toolbar icon that adds more submenu items?

[mapk]

We could probably drop them from the sidebar too!

[mtias]

The plus is a trailing inserter when a sub-menu already exists. It should show only for the currently selected level.

[obenland]

Work on #18310 should help alleviate some of this pain

[draganescu]

It feels as if this is a bug. I think I can remember that at some point all sub items behaved like the main items, and you could (like @mtias describes) only see the appender for the currently selected level.

[draganescu]

Yes, I found in git history that there was an issue with the registration of allowed blocks which prompted @talldan to hide menu items with css instead, but that leaves "on" all those appenders.

I added this #19598 small PR to hide appenders for other navigation levels. Not sure if this is the best approach but if it is, it will help when we implement those flyout ideas in #18310.

[obenland]

@draganescu Was this fixed by #19598?

[talldan]

Yep, I think this is fixed by #19598.