In the admin, when selecting related objects via the helpers defined in
`RelatedObjectLookups.js`, the `dismissRelatedLookupPopup` function was
attempting to access `window.relatedWindows`, which does not exist in
real execution, causing related lookup popups to remain open.
This change ensures that this code correctly accesses the module-local
`relatedWindows` by explicitly assigning it to `window.relatedWindows`.
Regression in 91bebf1adb43561b54bac18e76224759dc70acb3.
Thanks Matthias Kestenholz for the report, the fix ideas, and testing.
Co-authored-by: Matthias Kestenholz <mk@feinheit.ch>
Backport of a245604277eb9edeba234dacf199890766462709 from main.
Since 8b30360322d4de6687e17ab267a856db4e3c78a6, the admin documentation
is explicit that only modern evergreen browsers are supported. This
allows removing several long standing workarounds for IE and Opera older
versions.
Since 2013, Opera is based on the Chromium blink engine.
