Validation causes temporary flicker to invalid state CSS

[hlascelles]

When tabbing out of a valid field (and the field moves from isModified false => true), calls are made to the css handler that temporarily put it into an invalid state.

The changed that caused this was this one, where the function declaration order of the h_obsValidationTrigger and setError functions are reversed.

This is demonstrated in a simple JSFiddle here: https://jsfiddle.net/hlascelles/3Lz5ug8x/9/

The symptom is that any triggers/hooks that listen for DOM changes or CSS changes will fire even though the user did nothing wrong. In the example, this is shown using a CSS transition, which causes a form flicker.

Why was the method order reversed in that other PR? Could it be changed back?