web client: retrieve by TCN + MARC edit default view regression (and then some)

[Andrea Neiman]

I was looking at bug 1731272 and bug 1724348 in webby.evergreencatalog.com (3.0.0, head) and encountered a very weird regression/reemergence of bug 1708951 that resulted in this glorious screenshot:

https://imgur.com/a/09RPt

Here's how I made this happen:

1) I set my default view to MARC Edit
2) I searched a known record by TCN, and saw the exact semi-blank screen that Jane screencapped in comment #1 of bug 1708951. This is the main issue, as this should be patched on my test system.
3) I clicked back
4) I got a webby within a webby
5) Repeating steps 2 & 3 I got several levels of webby-ception.

[Kathy Lussier (klussier)]

I've seen this problem occur following other steps in a web client, but I haven't been able to pinpoint the series of steps. In all cases, though, the problem occurs when clicking the back button.

[Terran McCanna (tmccanna)]

Marking Won't Fix as it cannot be recreated in the current staff catalog.