Parent/Child Option List - selection is cleared if vertical size is too small

[ceeeekay]

Kibana version: 6.3.0

Elasticsearch version: 6.3.0

Server OS version:

Browser version: Firefox 60.0.2

Browser OS version: Ubuntu 18.04

Original install method (e.g. download page, yum, from source, etc.): apt

Describe the bug: In Firefox, If the vertical height of an Option List with a child list is set too small (fewer than 9 rows), values are cleared from the parent list as soon as they are selected. This issue does not occur in Chrome 66.0.3359.139 (Ubuntu 18.04).

IMO, the Option List takes up way too much vertical space and it's very tempting to try and squash it up as much as possible.

If the vertical size is set to fewer than 9 grid positions, the bottom portion of the vis renders outside the grid position allocated to it, although the vis appears normal. The only indication things are wrong is the drag handle is further up the right side than normal.

In this configuration, when a value is selected from the Option List, the vis will redraw (as it updates the child list ?), which resets the selection in the parent.

Steps to reproduce:

1. Add Option List with parent/child inputs to a dashboard
2. Squash it vertically to fewer than 9 grid snaps
3. Select a value from the Option List

Vertical size can be set above bottom of vis:

Expected behavior: The selection should stay in the Option List and not be reset, regardless of the size of the Option List.

Actual behavior: The whole vis redraws and clears whatever has been selected.

Feature request: Can we allow the content of this vis to be smaller? It takes up way too much space in a dashboard.

Thanks!

[nreese]

closing, duplicate of #15247