[BUG] Select Boxes (Data Source=URL) inside Data Grid cause side effects / flickering / extra XHRs

[Bob Leers]

formio.js versions affected:

• 4.16.0
• 4.17.4
• 4.18-rc8

Steps to Reproduce

(1) Add a Data Grid component.

(2) Add a Select Boxes component inside the Data Grid.

(3) Configure the Select Boxes its Data Source = URL:

Eg use the example URL https://cdn.rawgit.com/mshafrir/2646763/raw/states_titlecase.json
It's mentoined in the user guide "Select Box" section: https://help.form.io/userguide/form-building/form-components#select-box

Observed behavior

Screen flickering and additional/unpredictable XHRs when:

• Adding and removing Data Grid rows
• Checking select boxes

Remarks

This behaviour / issue doesn't occur when:

• Select Boxes in the form root or layout component.
• Select Boxes inside an Edit Grid component.

Let me know when you need more info or a JSFiddle.