Eclipse deadlocks when closing an editor among more than 10 when Breadcrumbs are enabled.

Refer to Eclipse.platform.ui/1079.
Deadlocks in Eclipse almost certainly are associated to having lots of editors open
and closing one, while Breadcrump display is enabled.
After disabling the latter option, with more than 20 editors open no lock down could be provoked any more.

The lock (no response, beach ball, had to force quit) occurred last on:
APPLE Mac Studio / Monterey 12.7 / JAVA 20.0.2 / Eclipse 4.29,
APPLE iMac 27'Rt / BigSur 11.7.10 / JAVA 20.0.2 / Eclipse 4.30M1
;JOOP!

Start by reading the referenced Eclipse.platform.ui/1079 issue and review the reported conditions: many open editors with Breadcrumbs enabled on macOS. Reproduce the hang while closing an editor, then verify that the deadlock no longer occurs under the reported scenarios.

Written by the indexing model from the issue text.