Possibility to easily "Select All" or "Select None" when choosing variable options

[travis_ottelien]

We haven't tested the use of variables a lot on the new dashboarding page though when having the ability to choose multiple items.

Could we get the option to quickly select "all" and deselect "all"? This will make things easier when we use the "Multi-Select" option.

[zietho · Accepted solution]

In progresss should go out with 1.266 or 1.267 the latest.