Aggregation builder config popovers stack up

[kroepke]

Expected Behavior

When configuring a pivot or series element in the aggregation builder, I'd expect that clicking outside of the popover closes it.

Current Behavior

I need to click "Done" to dismiss the popover, even though it is the only option I have. Even if I open another configuration popover the previous one does not dismiss.

Possible Solution

Either give me a "Cancel" button for reverting my changes next to the "Done" button, so I actually have a choice, or simply dismiss the popover when I'm clicking somewhere else.

Steps to Reproduce (for bugs)

1. Open Sources dashboard
2. Edit Histogram widget
3. Click timestamp pivot config
4. Click "count()" series config

Context

When clicking out to discover options, configuration items keep stacking up, which can get confusing: "Why is this still open, I didn't change anything and chose something else".
Especially new users might be confused by the amount of stacked popovers.

Your Environment

• Graylog Version: 3.2.1

[dennisoelkers]

Fixed in #10281.