In TAP Search panel, loading masks for Spatial/Temporal area and Column Constraints area prevent user from selecting another schema or table, while loading mask is displayed.
If loading-mask css class did not set z-index, the components would be displayed correctly, and select drop-down would appear on top of the loading mask.
Whenever possible, we should avoid using z-index, so that our components are following the natural stacking order, described in the link below:
|Status||To Do [ 10001 ]||In Progress [ 3 ]|
|Resolution||Done [ 10000 ]|
|Status||In Progress [ 3 ]||Done [ 10002 ]|