Validation warning icon broken in Firefox

[brynwhyman]

Overview

Recently implemented validation warning icons are not displaying in Firefox correctly:

Versions:

silverstripe/admin 1.6.2

Replication steps

You'll need to create a custom field with a validation rule. Replication steps in the previous PR

[brynwhyman]

Raising on behalf. Will come back with more details

[jareddreyerss]

Affected on:
Firefox (81.0.1) with macOS High Sierra (10.13.6)

[Cheddam]

This may be related to an issue we previously thought fixed - that the addition of new icons doesn't change the URL of the font files, meaning browsers may continue to cache the old version.

The fix for this didn't make it into a @silverstripe/webpack-config release until a couple of weeks ago, so the version used in admin may not yet contain it, leading to the regression in behaviour.

[Cheddam]

This should be fixed by #1133, which has been released as silverstripe/admin 1.6.3.