Additions to available 'Visible message actions'

[patricktokeeffe]

I'd love to have Mark read available as a toolbar button. It would be a good addition to Settings > Global settings > Display > Visible message actions. I think it should go between navigation and delete.

Similarly, I'd like to suppress the navigation buttons. It'd be nice if they were also exposed via the 'Visible message actions' list as a checkbox I could deactivate.

[cketti]

I'm not yet sure where we'll go with this feature. We might make the menu fully configurable or get rid of this feature altogether because configurable swipe-to-action is enough.

[cketti]

I created a new issue proposing a more generic solution to this problem: #5300