Commit window: Revert action produce a debugger

[jecisc]

Since a few versions of Pharo 13 now when I revert something in the commit window of Iceberg I get a debugger saying that an entity of the name of what I removed was not found in a collection.

This was not happening recently

[jecisc]

Dictionary>>errorKeyNotFound:
[self errorKeyNotFound: key] in Dictionary>>removeKey: in Block: [self errorKeyNotFound: key]
Dictionary>>removeKey:ifAbsent:
Dictionary>>removeKey:
IceNode>>removeChild:
IceTipDiffSelectingPanel(IceTipDiffPanel)>>diffEntryRemoved:
MessageSend>>value:
MessageSend>>cull:
MessageSend>>cull:cull:
[ action cull: anAnnouncement cull: announcer ] in AnnouncementSubscription(AbstractAnnouncementSubscription)>>deliver: in Block: [ action cull: anAnnouncement cull: announcer ]
FullBlockClosure(BlockClosure)>>on:do:
[ Processor terminateRealActive ] in [ :ex |
| onDoCtx handler bottom thisCtx |
onDoCtx := thisContext.
thisCtx := onDoCtx home.

		  "find the context on stack for which this method's is sender"

		  [ onDoCtx sender == thisCtx ] whileFalse: [
			  onDoCtx := onDoCtx sender.
			  onDoCtx ifNil: [ "Can't find our home context. seems like we're already forked
			and handling another exception in new thread. In this case, just pass it through handler."
				  ^ handlerAction cull: ex ] ].

		  bottom := [ Processor terminateRealActive ] asContext.
		  onDoCtx privSender: bottom.

		  handler := [ handlerAction cull: ex ] asContext.
		  handler privSender: thisContext sender.

		  (Process forContext: handler priority: Processor activePriority) resume.

		  "cut the stack of current process"
		  thisContext privSender: thisCtx.
		  nil ] in FullBlockClosure(BlockClosure)>>on:fork: in Block: [ Processor terminateRealActive ]

[guillep]

For the person taking this:

• try finding what Pharo build and PR that introduced the issue using the launcher (https://thepharo.dev/2020/11/23/bisecting-pharo-versions-to-find-regressions/). The objective here is to find the change, not to blame anybody, we are all entitled to make errors!
• try writing a test reproducing the issue. I understand that it's difficult to write a test for code we don't know, but I think there are great things to learn if we make an effort to test it.
• if you have a test + the cause => you can try to make a fix!