Tag filter search

[andreas1107]

Is your feature request related to a problem? Please describe.

I have many tags and it's cumbersome to select the correct one.

Describe the solution you'd like

A small search box when user clicks the "filter", so that the correct filters can be selected easily.

Describe alternatives you've considered

The master search on the top right partially works for this as it also searches tags. But then also other issues are displayed that has a similar text in the title / body / tags.

In order to reduce design clutter, perhaps the current search box could change its behaviour when the filter button is clicked, to start filtering among tags instead of searching in the board?

Additional context