[SOLR-14422] Solr 8.5 Admin UI shows Angular placeholders on first load / refresh

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 8.5, 8.5.1, 8.5.2, 8.6, 8.6.2
• Fix Version/s: 8.7
• Component/s: Admin UI
• Assignee: Eric Pugh
• Reporter: Colvin Cowie
• Created: 21/Apr/20 13:54
• Updated: 08/Aug/23 11:52
• Resolved: 06/Jul/20 18:57

Description

When loading / refreshing the Admin UI in 8.5.1, it briefly but visibly shows a placeholder for the "SolrCore Initialization Failures" error message, with a lot of redness. It looks like there is a real problem. Obviously the message then disappears, and it can be ignored.
However, if I was a first time user, it would not give me confidence that everything is okay. In a way, an error message that appears briefly then disappears before I can finish reading it is worse than one which just stays there.
 
Here's a screenshot of what I mean
 

I suspect that SOLR-14132 will have caused this

 
From a (very) brief googling it seems like using the ng-cloak attribute is the right way to fix this, and it certainly seems to work for me. https://docs.angularjs.org/api/ng/directive/ngCloak
I will attach a patch with it, but if someone who actually knows Angular etc has a better approach then please go for it

Issue Links

• is caused by: SOLR-14132 Upgrade Angular JS 1.3.8 to 1.7.9
• links to: GitHub Pull Request #1633
• links to: GitHub Pull Request #1654