Improve handling of mobile icon overflow

[juliusknorr]

As per recent discussion, the current way of overflowing icons has the problem that icons triggering a submenu might then create a two level submenu. Currently this is avoided by just always showing the emoji picker.

[mejo-]

Suggestion from @jancborchardt: The emoji picker could replace the action menu, then it is not as weird.

[juliusknorr]

Not sure I get that fully, the action menu would still be needed for the formatting actions that don't fit the width, or?

[mejo-]

Not sure I get that fully, the action menu would still be needed for the formatting actions that don't fit the width, or?

Sure. I think he meant to close the action menu once emoji picker is clicked and only display the emoji picker?

[juliusknorr]

Closing as a duplicate of #2836 which contains more details about the mobile menu bar redesign