[Workbench] Visible blanking between partial content reloads
A user visiting su92l Workbench reported visible blanking when parts of pages updated. This happened on the status page for a running pipeline, and on the Dashboard.
We opened the devtools' Network tab for a little while as these reloads happened. As best we could tell, the updated area would blank when Firefox finished loading the new HTML, would stay blank for a variable amount of time up to about 1 second, then render the new content.
I was unable to reproduce the problem on my system, also using Firefox, on the same pages at the same time the issue was observed.
Users should not see any blanking. New content should appear immediately over what it's replacing.