Hide addon icons if screen is too small

[fracklaus]

Hi,

when add-on icons are displayed in the navbar, the navbar itself can become invisible if too many add-ons are activated on a small screen. In this case, the number of displayed add-on icons should be limited. Ideally, it would be possible to choose which add-ons get displayed and which do not. This would allow for saving space even on bigger screens.

Thank you!